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  • Restoring GRUB2 on Software RAID 0 after Windows 7 wiped it using LiveCD

    - by unknownthreat
    I have installed Ubuntu 10.10 on my system. However, I need to install Windows 7 back, and I expect that it would alter GRUB and it did. Right now, my partition on my Software RAID 0 looks like this: nvidia_acajefec1 is Ubuntu 10.10 and nvidia_acajefec3 is Windows 7. I've been following some guides around and I am always stuck at GRUB not able to detect the usual RAID content. I've tried running: sudo grub > root (hd0,0) GRUB complains it couldn't find my hard disk. So I tried: find (hd0,0) And it complains that it couldn't find anything. So I tried: find /boot/grub/stage1 It said "file not found". Here's the text from the console: ubuntu@ubuntu:~$ grub Probing devices to guess BIOS drives. This may take a long time. [ Minimal BASH-like line editing is supported. For the first word, TAB lists possible command completions. Anywhere else TAB lists the possible completions of a device/filename. ] grub> root (hd0,0) root (hd0,0) Error 21: Selected disk does not exist grub> find /boot/grub/stage1 find /boot/grub/stage1 Error 15: File not found Fortunately, I got one person suggesting that what I've been trying to do is for GRUB Legacy, not GRUB2. So I went to the suggested website, ** (http://grub.enbug.org/Grub2LiveCdInstallGuide) **try to look around, and try: ubuntu@ubuntu:~$ sudo fdisk -l Unable to seek on /dev/sda This is just the step 2 of the instruction in the http://grub.enbug.org/Grub2LiveCdInstallGuide and I cannot proceed because it cannot seek /dev/sda. However, ubuntu@ubuntu:~$ sudo dmraid -r /dev/sdb: nvidia, "nvidia_acajefec", stripe, ok, 488397166 sectors, data@ 0 /dev/sda: nvidia, "nvidia_acajefec", stripe, ok, 488397166 sectors, data@ 0 So what now? Do you have an idea for how to make fdisk see my RAID array on live cd (Ubuntu 10.10)? Honestly, I am lost, very lost in trying to restore GRUB2 on this software RAID 0 system right now.

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  • To encryption=on or encryption=off a simple ZFS Crypto demo

    - by darrenm
    I've just been asked twice this week how I would demonstrate ZFS encryption really is encrypting the data on disk.  It needs to be really simple and the target isn't forensics or cryptanalysis just a quick demo to show the before and after. I usually do this small demo using a pool based on files so I can run strings(1) on the "disks" that make up the pool. The demo will work with real disks too but it will take a lot longer (how much longer depends on the size of your disks).  The file hamlet.txt is this one from gutenberg.org # mkfile 64m /tmp/pool1_file # zpool create clear_pool /tmp/pool1_file # cp hamlet.txt /clear_pool # grep -i hamlet /clear_pool/hamlet.txt | wc -l Note the number of times hamlet appears # zpool export clear_pool # strings /tmp/pool1_file | grep -i hamlet | wc -l Note the number of times hamlet appears on disk - it is 2 more because the file is called hamlet.txt and file names are in the clear as well and we keep at least two copies of metadata. Now lets encrypt the file systems in the pool. Note you MUST use a new pool file don't reuse the one from above. # mkfile 64m /tmp/pool2_file # zpool create -O encryption=on enc_pool /tmp/pool2_file Enter passphrase for 'enc_pool': Enter again: # cp hamlet.txt /enc_pool # grep -i hamlet /enc_pool/hamlet.txt | wc -l Note the number of times hamlet appears is the same as before # zpool export enc_pool # strings /tmp/pool2_file | grep -i hamlet | wc -l Note the word hamlet doesn't appear at all! As a said above this isn't indended as "proof" that ZFS does encryption properly just as a quick to do demo.

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  • Is micro-optimisation important when coding?

    - by BozKay
    I recently asked a question on stackoverflow.com to find out why isset() was faster than strlen() in php. This raised questions around the importance of readable code and whether performance improvements of micro-seconds in code were worth even considering. My father is a retired programmer, I showed him the responses and he was absolutely certain that if a coder does not consider performance in their code even at the micro level, they are not good programmers. I'm not so sure - perhaps the increase in computing power means we no longer have to consider these kind of micro-performance improvements? Perhaps this kind of considering is up to the people who write the actual language code? (of php in the above case). The environmental factors could be important - the internet consumes 10% of the worlds energy, I wonder how wasteful a few micro-seconds of code is when replicated trillions of times on millions of websites? I'd like to know answers preferably based on facts about programming. Is micro-optimisation important when coding? EDIT : My personal summary of 25 answers, thanks to all. Sometimes we need to really worry about micro-optimisations, but only in very rare circumstances. Reliability and readability are far more important in the majority of cases. However, considering micro-optimisation from time to time doesn't hurt. A basic understanding can help us not to make obvious bad choices when coding such as if (expensiveFunction() && counter < X) Should be if (counter < X && expensiveFunction()) (example from @zidarsk8) This could be an inexpensive function and therefore changing the code would be micro-optimisation. But, with a basic understanding, you would not have to because you would write it correctly in the first place.

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  • Cost effective way to provide static media content

    - by james
    I'd like to be able to deliver around 50MB of static content, either in about 30 individual files up to 10MB or grouped into 3 compressed files, around 5k to 20k times a day. Ideally I'd like to put some sort of very basic security around providing the data to ensure that a request is from the expected source, but if tossing the security for a big reduction in price is possible then it's an option. Does anyone have any suggestions other than what I've found: Google AppEngine is $0.12/GB & I believe has a file size limit of 10MB so I'd have to break the data up a bit. So a rough calculation would seem to be that this would cost me about $30 to $120 a day. Or I've seen something like what seems to be just public static content delivery with no type of logic capabilities like Usenet.nl at what I think calculates to about $0.025/GB which would cost me about $6 to $25 a day. Any idea if I'm going about these calculations right & if there might be a better option for just static content on a decently high volume delivery? Again some basic security would be great but if cost is greatly reduced without it then I'm up for that.

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  • What I saw at TechEd North America 2014

    - by Brian Schroer
    Originally posted on: http://geekswithblogs.net/brians/archive/2014/05/19/teched-north-america-2014.aspxI was thrilled to be able to attend TechEd North America 2014 in Houston last week. I got to go to Orlando in 2008, and since then I’ve had to settle for watching the sessions online (which ain’t bad – They’re all available on Channel 9 for streaming or downloading. Here are links to the Developer Track sessions and to the sessions from all tracks.) The sessions I attended (with my favorites bolded) were: Shiny new stuff The Microsoft Application Platform for Developers: Create Applications That Span Devices and Services INTRODUCING: The Future of .NET on the Server DEEP DIVE: The Future of .NET on the Server ASP.NET: Building Web Application Using ASP.NET and Visual Studio The Next Generation of .NET for Building Applications The Future of Visual Basic and C# Stuff you can use now Building Rich Apps with AngularJS on ASP.NET Get the Most Out of Your Code Maps SignalR: Building Real-Time Applications with ASP.NET SignalR Performance Optimize Your ASP.NET Web App Modern Web and Visual Studio Visual Studio Power User: Tips and Tricks Debugging Tips and Tricks in Visual Studio 2013 In a world where the whole company uses TFS… Using Functional, Exploratory and Acceptance Testing to Release with Confidence A Practical View of Release Management for Visual Studio 2013 From Vanity to Value, Metrics That Matter: Improving Lean and Agile, Kanban, and Scrum Ain’t Nobody Got Time for That As usual, there were some time slots with nothing of interest and others with 5 things I wanted to see at the same time. Here are the sessions I’m still planning to watch… Getting Started with TypeScript Building a Large Scale JavaScript Application in TypeScript Modern Application Lifecycle Management Why a Hacker Can Own Your Web Servers in a Day! Async Best Practices for C# and Visual Basic Building Multi-Device Apps with the New Visual Studio Tooling for Apache Cordova Applying S.O.L.I.D. Principles in .NET/C# Native Mobile Application Development for iOS, Android, and Windows in C# and Visual Studio Using Xamarin Latest Innovations in Developing ASP.NET MVC Web Applications Zero to Hero: Untested to Tested with Microsoft Fakes Using Visual Studio Cool and Elegant ASP.NET Web Forms with HTML 5 for the Modern Web The Present and Future of .NET in a World of Devices and Services

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  • Why does Eclipse keep crashing and dpkg erroring out?

    - by Sanju Sony Kurian
    I AM GETTING THE ERROR E: Sub-process /usr/bin/dpkg returned an error code (1) WHILE I WAS TRYING TO UPGRADE MY PC. i USE ECLIPSE AND IT KEEPS ON CRASHING... pLEASE HELP I ATTACH THE ERROR sanju@sanju-Dell-System-XPS-L502X:~$ upgrade Reading package lists... Done Building dependency tree Reading state information... Done The following packages have been kept back: aisleriot gir1.2-rb-3.0 gir1.2-totem-1.0 gnome-disk-utility gnome-keyring libgck-1-0 libgcr-3-1 libtotem0 linux-generic linux-headers-generic linux-image-generic rhythmbox rhythmbox-data rhythmbox-mozilla rhythmbox-plugin-cdrecorder rhythmbox-plugin-magnatune rhythmbox-plugin-zeitgeist rhythmbox-plugins seahorse totem totem-common totem-mozilla totem-plugins 0 upgraded, 0 newly installed, 0 to remove and 23 not upgraded. 1 not fully installed or removed. After this operation, 0 B of additional disk space will be used. Do you want to continue [Y/n]? Y Setting up grub-pc (1.99-21ubuntu3.1) ... /var/lib/dpkg/info/grub-pc.config: 35: /etc/default/grub: Syntax error: EOF in backquote substitution dpkg: error processing grub-pc (--configure): subprocess installed post-installation script returned error exit status 2 Errors were encountered while processing: grub-pc E: Sub-process /usr/bin/dpkg returned an error code (1)

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  • Sharing swap space between Windows and Ubuntu

    - by Leftium
    This Linux Swap Space Mini-HOWTO describes how to share swap space between Windows and Linux. Do these instructions still apply to Ubuntu in 2011? How should I modify the steps for Ubuntu? Is there a better approach to sharing swap space? Based on the HOWTO, it seems best to create a dedicated NTFS swap partition: Dedicated so the swap file will be contiguous and remain unfragmented. NTFS so both Windows and Ubuntu can read/write to it. (Or is FAT32 better for this purpose?) Then, configure Ubuntu to prepare the swap space for use by Linux on start up; by Windows on shut down. I want to dual boot Ubuntu and Windows 7 on my X301 laptop. However, my laptop only has a 64 GB SDD, so I would like to conserve as much disk space as possible. update: There is an alternate method using a special driver for Windows that let you use a Linux swap partition for temporary storage like a RAM-disk, but it doesn't seem to be as good...

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  • A new mission statement for my school's algorithms class

    - by Eric Fode
    The teacher at Eastern Washington University that is now teaching the algorithms course is new to eastern and as a result the course has changed drastically mostly in the right direction. That being said I feel that the class could use a more specific, and industry oriented (since that is where most students will go, though suggestions for an academia oriented class are also welcome) direction, having only worked in industry for 2 years I would like the community's (a wider and much more collectively experienced and in the end plausibly more credible) opinion on the quality of this as a statement for the purpose an algorithms class, and if I am completely off target your suggestion for the purpose of a required Jr. level Algorithms class that is standalone (so no other classes focusing specifically on algorithms are required). The statement is as follows: The purpose of the algorithms class is to do three things: Primarily, to teach how to learn, do basic analysis, and implement a given algorithm found outside of the class. Secondly, to teach the student how to model a problem in their mind so that they can find a an existing algorithm or have a direction to start the development of a new algorithm. Third, to overview a variety of algorithms that exist and to deeply understand and analyze one algorithm in each of the basic algorithmic design strategies: Divide and Conquer, Reduce and Conquer, Transform and Conquer, Greedy, Brute Force, Iterative Improvement and Dynamic Programming. The Question in short is: do you agree with this statement of the purpose of an algorithms course, so that it would be useful in the real world, if not what would you suggest?

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  • CodePlex Daily Summary for Tuesday, October 30, 2012

    CodePlex Daily Summary for Tuesday, October 30, 2012Popular ReleasesCleverBobCat: CleverBobCat 0.4: Added: ModuleCleverResourceTransferMCEBuddy 2.x: MCEBuddy 2.3.6: Changelog for 2.3.6 (32bit and 64bit) 1. Fixed a bug in multichannel audio conversion failure. AAC does not support 6 channel audio, MCEBuddy now checks for it and force the output to 2 channel if AAC codec is specified 2. Fixed a bug in Original Broadcast Date and Time. Original Broadcast Date and Time is reported in UTC timezone in WTV metadata. TVDB and MovieDB dates are reported in network timezone. It is assumed the video is recorded and converted on the same machine, i.e. local timezone...ZXMAK2: Version 2.6.8.0: Whats new: add Spectrum +3 model; tape serializer: show extended info for crc bad blocksMicrosoft Ajax Minifier: Microsoft Ajax Minifier 4.73: Fix issue in Discussion #401101 (unreferenced var in a for-in statement was getting removed). add the grouping operator to the parsed output so that unminified parsed code is closer to the original. Will still strip unneeded parens later, if minifying. more cleaning of references as they are minified out of the code.RiP-Ripper & PG-Ripper: PG-Ripper 1.4.03: changes FIXED: Kitty-Kats new Forum UrlJobboard Light Edition: Version 2.2: Major Release Parallalization Added Job posting now working Job Editing now working Search Box Clear Filters added Search criteria updated (more simple) jobdetails page displays missing selections parameters added to url Cleaned UI moreMJP's DirectX 11 Samples: MSAA Resolve Filtering: Sample application and source code from the article "Experimenting with Reconstruction Filters for MSAA Resolve" http://mynameismjp.wordpress.com/2012/10/28/msaa-resolve-filters/Liberty: v3.4.0.1 Release 28th October 2012: Change Log -Fixed -H4 Fixed the save verification screen showing incorrect mission and difficulty information for some saves -H4 Hopefully fixed the issue where progress did not save between missions and saves would not revert correctly -H3 Fixed crashes that occurred when trying to load player information -Proper exception dialogs will now show in place of crashesPlayer Framework by Microsoft: Player Framework for Windows 8 (Preview 7): This release is compatible with the version of the Smooth Streaming SDK released today (10/26). Release 1 of the player framework is expected to be available next week. IMPROVEMENTS & FIXESIMPORTANT: List of breaking changes from preview 6 Support for the latest smooth streaming SDK. Xaml only: Support for moving any of the UI elements outside the MediaPlayer (e.g. into the appbar). Note: Equivelent changes to the JS version due in coming week. Support for localizing all text used in t...Send multiple SMS via Way2SMS C#: SMS 1.1: Added support for 160by2Quick Launch: Quick Launch 1.0: A Lightweight and Fast Way to Manage and Launch Thousands of Tools and ApplicationsPress Win+Q and start to search and run. http://www.codeplex.com/Download?ProjectName=quicklaunch&DownloadId=523536Orchard Project: Orchard 1.6: Please read our release notes for Orchard 1.6: http://docs.orchardproject.net/Documentation/Orchard-1-6-Release-Notes Please do not post questions as reviews. Questions should be posted in the Discussions tab, where they will usually get promptly responded to. If you post a question as a review, you will pollute the rating, and you won't get an answer.Media Companion: Media Companion 3.507b: Once again, it has been some time since our release, and there have been a number changes since then. It is hoped that these changes will address some of the issues users have been experiencing, and of course, work continues! New Features: Added support for adding Home Movies. Option to sort Movies by votes. Added 'selectedBrowser' preference used when opening links in an external browser. Added option to fallback to getting runtime from the movie file if not available on IMDB. Added new Big...MSBuild Extension Pack: October 2012: Release Blog Post The MSBuild Extension Pack October 2012 release provides a collection of over 475 MSBuild tasks. A high level summary of what the tasks currently cover includes the following: System Items: Active Directory, Certificates, COM+, Console, Date and Time, Drives, Environment Variables, Event Logs, Files and Folders, FTP, GAC, Network, Performance Counters, Registry, Services, Sound Code: Assemblies, AsyncExec, CAB Files, Code Signing, DynamicExecute, File Detokenisation, GUI...NAudio: NAudio 1.6: Release notes at http://mark-dot-net.blogspot.co.uk/2012/10/naudio-16-release-notes-10th.htmlPowerShell Community Extensions: 2.1 Production: PowerShell Community Extensions 2.1 Release NotesOct 25, 2012 This version of PSCX supports both Windows PowerShell 2.0 and 3.0. See the ReleaseNotes.txt download above for more information.Umbraco CMS: Umbraco 4.9.1: Umbraco 4.9.1 is a bugfix release to fix major issues in 4.9.0 BugfixesThe full list of fixes can be found in the issue tracker's filtered results. A summary: Split buttons work again, you can now also scroll easier when the list is too long for the screen Media and Content pickers have information of the full path of the picked item Fixed: Publish status may not be accurate on nodes with large doctypes Fixed: 2 media folders and recycle bins after upgrade to 4.9 The template/code ...AcDown????? - AcDown Downloader Framework: AcDown????? v4.2.2: ??●AcDown??????????、??、??、???????。????,????,?????????????????????????。???????????Acfun、????(Bilibili)、??、??、YouTube、??、???、??????、SF????、????????????。 ●??????AcPlay?????,??????、????????????????。 ● AcDown??????????????????,????????????????????????????。 ● AcDown???????C#??,????.NET Framework 2.0??。?????"Acfun?????"。 ????32??64? Windows XP/Vista/7/8 ???? 32??64? ???Linux ????(1)????????Windows XP???,????????.NET Framework 2.0???(x86),?????"?????????"??? (2)???????????Linux???,????????Mono?? ??2...Rawr: Rawr 5.0.2: This is the Downloadable WPF version of Rawr!For web-based version see http://elitistjerks.com/rawr.php You can find the version notes at: http://rawr.codeplex.com/wikipage?title=VersionNotes Rawr Addon (NOT UPDATED YET FOR MOP)We now have a Rawr Official Addon for in-game exporting and importing of character data hosted on Curse. The Addon does not perform calculations like Rawr, it simply shows your exported Rawr data in wow tooltips and lets you export your character to Rawr (including ba...CRM 2011 Visual Ribbon Editor: Visual Ribbon Editor (1.3.1025.5): [NEW] Support for connecting to CRM Online via Office 365 (OSDP) [NEW] Current connection information and loaded ribbon name are displayed in the status bar [IMPROVED] Connect dialog minor improvements and error message descriptions [IMPROVED] Connecting to a CRM server will close currently loaded ribbon upon confirmation (if another ribbon was loaded previously) [FIX] Fixed bug in Open Ribbon dialog which would not allow to refresh entity list more than onceNew Projects10010dshjlahfajhflkjhkjhherkjhfkja: 10010dshjlahfajhflkjhkjhherkjhfkjaA supplementary Machine Learning and Evolutionary Computation suite for Orange: ML & EC tools such as: - Optimization Meta-heuristics (EDAs, cGA) - Feature Selection - Kernel Methods - Dependency NetworksATH TaskList 2012: ATH TaskList 2012Canlipe: This is a simple C# / Mono (.NET) static blog generator. Nothing fancy, just the basic functionality at the moment. The code is really dirty too.com.sogeti.certif: Basic but essential source code example for SharePoint 2010Duhking: A quasi-duck typing library for .Net. It doesn't provide "real" duck typing, but it kinda looks a little bit like a duck if you squint and look at it from a distance. This library is built on and for .Net 3.5,Guestbook 2: A highly customizable program to track people visiting a booth via recording their name and some basic information. Written in C#.Interval Mandelbrot Explorer: Explore the Mandelbrot set using interval arithmetic.Isel - Projecto: projecto para isel....killStudentMain: killStudentMainKWSystem-WithClient: c++??La villa del seis: La villa del seis is a multiplatform point-and-click graphical adventure. Also, you can play it like a text adventure (interactive fiction) on a text browser (like Links, w3m or Lynx) or in a normal browser without JavaScript support.malversuchen: Das ist ein TEstPhotoCloud: This is a sample ASP.NET Web Pages app that uses Twitter authentication, HTMl5 drag and drop file uploading, blob storage, and SignalR to build a photo sharing platnosci-test: testSharePoint GSC: SharePoint GSC is a set of SharePoint utilities developed in General de Software. SHCODE: SH Project please contact little_deer@hotmail.com for more details.SimpleImageCacherRT: WinRT????????????????????。Windows.UI.XAML.Controls.Image????Source?????????????????????。???????????????…SLIP Framework: SilverLightweight Prism FrameworkSmallCheck: F# exhaustive testing framework. Port of Haskell SmallCheck test librarySolution organizer: Help developers organizing their Visual Studio 2010 solutionsSukul: Web 2.0 Portal for powering modern CMStestjabbr1029: heTFS Reflect Work Items Links: This small utility allows complex TFS to TFS migration to preserve work item links during the process. It is used in complement with the TFS Integration tools.XactiSource Application Framework: The XactiSource Application Framework is an attempt to add basic functionality that can be used from one project to the next. Yasminoku: Yasminoku is an open source "Sudoku" alike game totally written in DHTML (JavaScript, CSS and HTML) that uses mouse. Includes sudoku solver. This cross-platform and cross-browser game was tested under BeOS, Linux, *BSD, Windows and others.Zalgo for Word: Zalgo addin for Word 2010

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  • Collision Detection for a 2D RPG

    - by PHMitrious
    First of all, I have done some research on this topic before asking, and I'm asking this question as a mean to get some opinions on this topic, so I don't make a decision only on my own, but taking into account other people's experience as well. I'm starting a 2D online RPG project. I am using SFML for graphics and input and I'm creating a basic game structure and all for the game, creating modules for each part of the game. Well, let me get to the point I just wanted to give you guys some context. I want to decide on how I'm going to work with collision detection. Well I'm kinda going to work on maps with a tile map divided in layers (as usual) and add an extra 2 layers - not exactly in the map - for objects. So I'll have collisions between objects and agents (players - npcs - monsters - spells etc) and agents and tiles. The seconds one can be easily solved the first one need a little bit of work. I considered both creating a basic collision test engine using polygons and a quadtree to diminish tests since I'm going to be working with big maps with lots of objects - creating both a physical and graphical world representation. And I also considered using a physics engine like Box2D for collision tests. I think the first approach would take more work on my part but the second one would have the overhead of using a whole physics engine for just collision detection and no physics. What do you guys think ?

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  • How can I install oracle-java7 from webupd8 ppa?

    - by Ahmed Zain El Dein
    I installed ppa:webupd8team/java and I get the following error Output from: sudo apt-get install oracle-java7-installer Reading package lists... Done Building dependency tree Reading state information... Done Suggested packages: binfmt-support visualvm ttf-baekmuk ttf-unfonts ttf-unfonts-core ttf-kochi-gothic ttf-sazanami-gothic ttf-kochi-mincho ttf-sazanami-mincho ttf-arphic-uming The following packages will be upgraded: oracle-java7-installer 1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. 1 not fully installed or removed. Need to get 0 B/16.0 kB of archives. After this operation, 64.5 kB of additional disk space will be used. Could not exec dpkg! E: Sub-process /usr/bin/dpkg returned an error code (100) i did afterwords those line of code trying to resolve the issue becuase it is not existed actually in the /usr/bin/dpkg there is no dpkg mkdir /tmp/dpkg cd /tmp/dpkg wget http://archive.ubuntu.com/ubuntu/pool/main/d/dpkg/dpkg_1.15.5.6ubuntu4_i386.deb ar x dpkg*.deb data.tar.gz tar xfvz data.tar.gz ./usr/bin/dpkg sudo cp ./usr/bin/dpkg /usr/bin/ sudo apt-get update sudo apt-get install --reinstall dpkg then i get this $ sudo apt-get install --reinstall dpkg Reading package lists... Done Building dependency tree Reading state information... Done 0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 6 not upgraded. 1 not fully installed or removed. Need to get 0 B/1,814 kB of archives. After this operation, 0 B of additional disk space will be used. dpkg: warning: 'dpkg-deb' not found on PATH. dpkg: 1 expected program(s) not found on PATH. NB: root's PATH should usually contain /usr/local/sbin, /usr/sbin and /sbin. E: Sub-process /usr/bin/dpkg returned an error code (2) How can I fix this?

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  • Boot problems w/ External HDD

    - by JeremyT
    I'm having a problem with booting a live image off of a USB Hard Drive. I used Startup Disk Creator to make an Ubuntu 11.10 live image on a partition on my external so that I can use it on various computers. I set it up with ~4GB of persistent data So far I've tried it on two computers. One, a Dell, will boot to my external but it loads the select boot device very slowly. It hangs on a screen with an underscore for up to 5 minutes until it allows me to select which drive I want to boot from. After that, it works great. However, on my primary computer it doesn't work at all. It's an Acer from 2009 and it won't even recognize the drive. I don't see it anywhere in BIOS or the select boot disk list. The light on the external will come on at boot just fine so I know it's powering it at this time. Both computers worked perfectly with my 4GB flash drive that I had partitioned half and half (1st half FAT32 and second Ubuntu 11.10 live)

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  • Fresh install of Ubuntu 12.10 won't boot on Asus X101CH Eee PC

    - by Najdmie
    I did a fresh install of Ubuntu 12.10 in my Asus X101CH Eee PC, using a live usb which I made using startup disk creator, replacing Ubuntu 12.04. The installation ran smoothly, but when I boot, it goes to a purple screen for a second, then a lot of text like the following shows up in sequence: Starting crash report submission daemon [OK] Starting CPU interrupts balancing daemon [OK] Stopping save kernel messages [OK] _ And the cursor just keeps blinking for hours. I can't log in. Pressing Alt + F2 did not bring me to console mode. I thought it might be a partition problem so I formatted the whole disk, by creating a new partition table using gparted in Ubuntu 12.04 live USB. I noticed that I can't try Ubuntu using 12.10 live USB either; it just went to a blank screen when I hit the 'try ubuntu' button. But the same problem arose. I even changed the pen drive for the live USB a couple of times. I happened to know that the Intel Atom N2600 Cedar Trail CPU in my computer is not well supported in Linux, I managed to install its drivers in Ubuntu 12.04, although the computer went blank during the installation.

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  • Using Quickly for text-heavy app

    - by Kevin
    I am trying to create a small app that displays documentation. When it is run, the application window will display a main menu with buttons labeled 'Document 1', 'Document 2', etc. If a user clicks on one of those buttons, the text from the corresponding document will be displayed in the window. Very basic. The text documents range in length from 1000 to 5000 words, and they need basic formatting (bold, italic, maybe one or two font choices). My question is this: what is the best way to store and display long blocks of formatted text, using Quickly? There seems to be a few options: (1) I could load the text blocks into long python strings, (2) I could load the text from text files, or (3) I could somehow copy and paste the formatted text into Glade. In the first two options, I'm not sure how I would format the text (add italic and bold, for instance) once it was loaded. I have experience with PHP/MySQL/HTML/CSS/Javascript, but I'm new to Python. Any help would be appreciated.

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  • Cannot access the filesystems using LiveCD (LVM2,EXT2)

    - by ftkg
    I have to restore the /etc/passwd file I accidentally renamed in my Ubuntu Server, so I booted the machine using a LiveCD. Problem is, the system filesystem does not appear in Nautilus, under 'Devices'. Am I missing anything? ubuntu@ubuntu:~$ sudo fdisk -l Disk /dev/sda: 320.1 GB, 320072933376 bytes 255 heads, 63 sectors/track, 38913 cylinders, total 625142448 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000956dc Device Boot Start End Blocks Id System /dev/sda1 * 2048 499711 248832 83 Linux /dev/sda2 501758 625141759 312320001 5 Extended /dev/sda5 501760 625141759 312320000 8e Linux LVM ubuntu@ubuntu:~$ mount /cow on / type overlayfs (rw) proc on /proc type proc (rw,noexec,nosuid,nodev) sysfs on /sys type sysfs (rw,noexec,nosuid,nodev) udev on /dev type devtmpfs (rw,mode=0755) devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620) tmpfs on /run type tmpfs (rw,noexec,nosuid,size=10%,mode=0755) /dev/sr0 on /cdrom type iso9660 (ro,noatime) /dev/loop0 on /rofs type squashfs (ro,noatime) none on /sys/fs/fuse/connections type fusectl (rw) none on /sys/kernel/debug type debugfs (rw) none on /sys/kernel/security type securityfs (rw) tmpfs on /tmp type tmpfs (rw,nosuid,nodev) none on /run/lock type tmpfs (rw,noexec,nosuid,nodev,size=5242880) none on /run/shm type tmpfs (rw,nosuid,nodev) gvfs-fuse-daemon on /home/ubuntu/.gvfs type fuse.gvfs-fuse-daemon (rw,nosuid,nodev,user=ubuntu) ubuntu@ubuntu:~$ sudo blkid /dev/loop0: TYPE="squashfs" /dev/sda1: UUID="aad69790-198d-45bc-9ccd-e4cba7456914" TYPE="ext2" /dev/sda5: UUID="wbIDX7-RILL-VtFT-gX15-N1GJ-Yyfg-V8Oe5m" TYPE="LVM2_member" /dev/sr0: LABEL="Ubuntu 12.04 LTS i386" TYPE="iso9660" ubuntu@ubuntu:~$ cat /etc/fstab overlayfs / overlayfs rw 0 0 tmpfs /tmp tmpfs nosuid,nodev 0 0

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  • Managing Kindle Fire with on 12.04 via Micro-USB

    - by pirtle
    To begin, I have read both Is there a way to get a Kindle Fire to work with 12.04? and How can I transfer files to a Kindle Fire with a Micro-USB cable? My problem is that I am unable to mount my Kindle Fire in order to add books to it. I have installed calibre, but it is unable to manage any devices until the computer itself has recognized it. The latter post had an excellent answer (provided by @jeremiah) that was making some progress. Unfortunately, I think I don't know enough about the -t flag used with mount. This is what I've done... Ran dmesg to locate the device: [ 3.920886] sd 6:0:0:0: [sdb] Attached SCSI removable disk Confirmed it's location: $ sudo ls -l /dev/disk/by-id lrwxrwxrwx 1 root root 9 Aug 18 15:52 usb-Amazon_Kindle_3C6C002600000001-0:0 -> ../../sdb So we know that my Kindle is recognized on /dev/sdb. I then used the mount command suggested by @jeremiah: $ sudo mount -t ext3 /dev/sdb/ /mnt/kindle/ mount: no medium found on /dev/sdb The same error occurs for sudo mount /dev/sdb /mnt/kindle. Note: I have created the 'kindle' directory in 'mnt' Any suggestions?

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  • Resize a pendrive Linux?

    - by user11239
    I'm running Ubuntu from USB media, which has a drive capacity of 250 GB, all existing as one FAT32 partition. However, when I created the bootable Ubuntu drive, only 4.79 GB were allocated for usage. Rather than put files directly into the /cdrom where the drive is mounted, I want to expand what is listed here in aufs to be at least 200 GB. I'm hopeful that I can do this live. Output of df : Filesystem 1K-blocks Used Available Use% Mounted on aufs 4051904 4050108 0 100% / none 1542852 284 1542568 1% /dev /dev/sdb1 244076800 4901648 239175152 3% /cdrom /dev/loop0 688000 688000 0 100% /rofs none 1547840 1496 1546344 1% /dev/shm tmpfs 1547840 4828 1543012 1% /tmp none 1547840 80 1547760 1% /var/run none 1547840 0 1547840 0% /var/lock none 1547840 0 1547840 0% /lib/init/rw Output of fdisk -l : Disk /dev/sdb: 250.1 GB, 250059350016 bytes 255 heads, 63 sectors/track, 30401 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00083fe4 Device Boot Start End Blocks Id System /dev/sdb1 * 1 30401 244196001 c W95 FAT32 (LBA) So basically what I want to do is get /dev/sdb1 to be entirely, or almost entirely read as aufs. I'm confused over how to do this, as the file systems are all part of /dev/sdb1 on one big partition, rather than separate partitions for separate file systems.

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  • Microsoft ADO.NET 4 Step by Step

    - by Sahil Malik
    Ad:: SharePoint 2007 Training in .NET 3.5 technologies (more information). Many years ago, I wrote Pro ADO.NET 2.0. I still think that in the plethora of new data access technologies that have come out since, the basic core ADO.NET fundamentals are still every developer must know, and sadly they do not know. So for some crazy reason, I still see every project make the same data access related mistakes over and over again. Anyway, the challenge is that on top of the core ADO.NET fundamentals, there is a vast array of other new technologies you must learn. The important of which is Entity Framework. So, I was asked to, and I was pleased to be the technical reviewer for Microsoft ADO.NET 4, Step by Step, by Tim Patrick. This book introduces the reader not just to the basic ADO.NET principles, but also Entity Framework, LINQ to SQL, and WCF Data Services. So what you may ask is a SharePoint guy like me doing with such interest in ADO.NET land? Well, that’s what the other side says, what is a hardcore data access sorta guy doing in SharePoint land? :). I have authored/co-authored 4 books so far on data access (1,2,3,4), and one on pure SharePoint, and now one on SharePoint 2010 BI. These are very intertwined topics. And LINQ to SQL and LINQ to SharePoint are almost copy paste of each other. WCF Data services are literally the same in both. And many Entity Framework concepts also apply within SharePoint. So there, I did these both for “interest” reasons. Comment on the article ....

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  • What do I need to know to design a language and write a interpreter for it?

    - by alFReD NSH
    I know this question has been asked and even there are thousands of books and articles about it. But the problem is that there are too many, and I don't know are they good enough, I have to design a language and write a interpreter for it. The base language is javascript (using nodejs) but it's ok if the compiler was written in another language that I can use from node. I had done a research about compiler compilers in JS, there is jison (Bison implementaion in JS), waxeye, peg.js. I decided to give jison a try, due to the popularity and its being used by coffee script, so it should be able to cover my language too. The grammar definition syntax is similar to bison. But when I tried read the bison manual it seemed very hard to understand for me. And I think it's because I don't know a lot of things about what I'm doing. Like I don't what is formal language theory. I am experienced in Javascript (I'm more talented in JS than most average programmers). And also know basic C and C++ (not much experience but can write a working code for basic things). I haven't had any formal education, so I may not be familiar with some software engineering and computer science principles. Though everyday I try to grasp a lot of articles and improve. So I'm asking if you know any good book or article that can help me. Please also write why the resource you're suggesting is good. --update-- The language I'm trying to create, is not really complicated. All it has is expressions (with or without units), comparisons and logical operators. There are no functions, loops, ... The goal is to create a language that non-programmers can easily learn. And to write customized validations and calculations.

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  • Can no longer boot with rEFIt and Grub on early 2006 MacBook Pro

    - by Don Quixote
    I don't know what happened to cause this. I have Snow Leopard, Ubuntu 11.04 Natty Narwhal and Windows XP SP3 on my early 2006 MacBook Pro. It is a Core Duo unit, NOT Core 2 Duo, so it is 32-bit only - Model Identifier MacBookPro1,1. I use rEFIt 0.14 for my boot menu. For some reason neither XP nor Ubuntu would boot anymore. I'd just get a black screen with a rapidly flashing underscore in the top-left corner. Having both those OSes failing to boot suggested a problem with the boot loader in my MBR. The rEFIT partition tool verified that my MBR partitions were still synced with my GPT partitions, so I rewrote my MBR partition table with fdisk while booted from Parted Magic: # fdisk /dev/sda (fdisk warns about the disk having a GPT. I press on anyway.) p (Print the existing partition table to make sure it's OK.) w (Write the old partition table back to disk. This also writes a new MBR boot loader.) After this XP would boot but Ubuntu would not, with the same symptom. Now I used update-grub while chrooted into Ubuntu from Parted Magic: # mount /dev/sda3 /mnt # mount --bind /dev /mnt/dev # mount --bind /sys /mnt/sys # mount --bind /proc /mnt/proc # chroot /mnt Chroot issues some warnings about not being able to identify some group IDs. I don't know why that happens, or whether it is a problem. At this point while I am still booted off of Parted Magic's kernel, I am running from Natty's filesystem. # update-grub Update-grub detects each of my operating systems then claims to complete successfully, but still won't boot. I asked this same question over at rEFIt's Sourceforge support forum but there have been no replies yet. I also Googled quite a bit, and see many who have the same black screen problem, but none of their situations seem quite like mine. Thanks for any help you can give me. -- Don Quixote

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  • invite: WEBLOGIC 12c HANDS-ON WORKSHOP IN PARIS

    - by mseika
    Oracle WebLogic 12c InnovationWorkshopApril 24-26, 2012: Colombes, France Workshop Description Oracle Fusion Middleware is the #1 application infrastructure foundation and WebLogic Server is the #1 Application Server across conventional and cloud environments. It enables enterprises to create and run agile and intelligent business applications and maximize IT efficiency by exploiting modern hardware and software architectures. Do you want to learn more about innovative features, capabilities and roadmap of WebLogic Server 12c? Then this technical hands-on workshop is for you. Agenda Outline WebLogic introduction WebLogic Topology WebLogic Clustering and High Availibility Coherence Troubleshooting Entreprise Messaging Development Tools & Productivity Performance Exalogic Introduction Entreprise Manager Grid Control Oracle Public Cloud Oracle Traffic Director Lab Outline WebLogic Installation & Configuration WebLogic Clustering & HA Coherence Use Cases & Monitoring WebLogic Active GridLink for RAC Integration Messaging: JMS Audience WebLogic Consultants & Architects Prerequisites Basic knowledge in Java and JavaEE Understanding the Application Server concept Basic knowledge in older releases of WebLogic Server would be beneficial Equipment Requirements This workshop requires attendees to provide their own laptops for this class. Attendee laptops must meet the following minimum hardware/software requirements: Minimum 4GB RAM, 30GB free disk space Internet Explorer 7 or Firefox 3 or higher Download and install Oracle VM VirtualBox 4.1.8 AgendaThis workshop is 3 days. 8:30 am Sign-In and technical set up9:00 am: Workshop starts5:00 pm: Workshop ends This workshop is Free but space is limited. Register now!Register Here!

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  • Blank screen after GRUB (64 bit) - cannot install Ubuntu

    - by peGGi
    My laptop's specs: Lenovo IdeaPad Z570 Intel Core i5-2410M @ 2.3Ghz 6 Gb RAM DDR3 640 Gb ATAPI Hard-disk Drive @ 5,200 RPM NVIDIA GeForce G520M with Optimus switching technology Broadcom 802.11n Network Adapter REALTEK soundcard Windows 7 Home Premium 64-bit I downloaded Ubuntu Studio 11.04 and burned the iso image onto two different DVDs, using two different programs (one DVD is RW, the other is just R). I verified the hash MD5sum thing. I get as far as GRUB with the 4 options (install, advanced install, disk verification, system rescue) but no matter which one I select, I get a blank screen and nothing happens. The DVD drive spins down after about 30 seconds. Also just before the GRUB screen I get a message saying Error: "Prefix" is not set. I'm not sure if that's relevant. I have tried all the options using both DVDs. Same thing happens. I have changed the graphics setting in BIOS to UMA or Optimus, but still happens either way. I've tried booting with the wireless switch turned off, same thing happens. I downloaded 'vanilla' Ubuntu 64-bit and burned onto a CD, and the same thing happens. I have downloaded Ubuntu 32-bit and I am able to boot from the live CD (interestingly the wireless card won't work, but that's maybe another issue). I have searched extensively through these forums and other sites but I can't see anything that will help me. Is there something I'm missing? I'd really appreciate help on this. The laptop is less than 2 weeks old. I was so looking forward to getting Ubuntu Studio up and running. I've gone about as far as my technical abilities will allow.

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  • Bad archive mirror using PXE boot method

    - by user11566
    I'm trying to automatically install Ubuntu on a client PC by using the PXE BOOT method....my Objectives are below: I am following the steps given in this link installation using PXE BOOT the server will have a KICKSTART config file which contains the parameters for the OS installation and the files which are required for the OS installations. the client will have to detect this configuration along with the setup files and complete the installation without any input from the user. In my server I have installed DHCP3-server,Apache2 and TFTP to help me with the installation. I have nearly achieved my first objective, I am able to boot my client using the files stored in the server but during the installation stage it is asking me to CHOOSE A MIRROR OF UBUNTU ARCHIVE I gave the server's IP address and the path in the server where the files are located but then its giving me this error BAD ARCHIVE MIRROR So is it possible that instead of downloading all the files from the internet and storing them on my disk can I use the files which comes with the UBUNTU-CD, and how to store these files in what format (should I zip them) on the disk? secondly I am also generating the ks.cfg which I wanted to give to the client for automatic installation of the OS. So how should the configuration file be given to the installation process?

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  • Complexity of defense AI

    - by Fredrik Johansson
    I have a non-released game, and currently it's only possible to play with another human being. As the game rules are made up by me, I think it would be great if new players could learn basic game play by playing against an AI opponent. I mean it's not like Tennis, where the majority knows at least the fundamental rules. On the other hand, I'm a bit concerned that this AI implementation can be quite complex. I hope you can help me with an complexity estimation. I've tried to summarize the gameplay below. Is this defense AI very hard to do? Basic Defense Game Play Player Defender can move within his land, i.e. inside a random, non-convex, polygon. This land will also contain obstacles modeled as polygons, that Defender has to move around. Player Attacker has also a land, modeled as another such polygon. Assume that Defender shall defend against Attacker. Attacker will then throw a thingy towards Defender's land. To be rewarded, Attacker wants to hit Defender's land, and Defender will want to strike away the thingy from his land before it stops to prevent Attacker from scoring. To feint Defender, Attacker might run around within his land before the throw, and based on these attacker movements Defender shall then continuously move to the best defense position within his land.

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  • What is a good toy example to teach version control?

    - by janos
    I am looking for practical examples to use when teaching version control. Breaking down the material to basic concepts and providing examples is an obvious way to teach version control, but this can be very boring, unless the examples are really practical or interesting. One idea I have is customizing a wordpress theme. I use wordpress a lot and no theme is ever perfect, so I typically just put the theme directory in version control using any dvcs and start recording changes. The problem with this example is that not many people in the audience may be familiar with wordpress, let alone have shell access to a wordpress site to try out the commands. Preparing a mock site and giving access to everyone is also not an option for me. I need a "toy example" that can be interesting to a broad audience of software developers, and something they can try on their own computers. The tutorial will use a dvcs, but the practical example I'm looking for is only to teach the basic features of version control, ignoring the distributed features for the moment. (Now that I think of it, instead of a mock site, a customized live cd might do the trick...) Any better ideas?

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