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• How to use driver for printer?

  - by jamie

  I've been trying to get my Lexmark x1290 to work on Ubuntu 12.04. According to this post, the z600 driver should work to print, so I downloaded the z600 driver from here and installed it through the Ubuntu Software Center. I plugged in my printer and went to the "Printer" section under System Settings... and followed the wizard to install it. It showed up as "1200-series" but never gave me a choice to choose the driver and when I try to print to it, it pops up a message that it is printing and then that it is done printing, but it is definitely not printing anything. What am I doing wrong here?

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• How do you unit test your javascript.

  - by Erin

  I spend a lot of time working in javascript of late. I have not found a way that seems to work well for testing javascript. This in the past hasn't been a problem for me since most of the websites I worked on had very little javascript in them. I now have a new website that makes extensive use of jQuery I would like to build unit tests for most of the system. My problems are this. Most of the functions make changes to the DOM in some way. Most of the functions request data from the web server as well and require a session on the service to get results back. I would like to run the test from either a command line or a test running harness rather then in a browser. Any help or articles I should be reading would be helpful.

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• Books or guides regarding secure key storage and database encryption

  - by Matty

  I have an idea for a SaaS product I want to create, however, this product will store extremely sensitive data that needs to be encrypted at rest. The trouble is not so much the encryption, but the problem of securely storing the keys so that in the event the server was somehow compromised, the keys couldn't just be recovered and used to decrypt the database. Are there any decent books to guides regarding database encryption, and in particular secure key storage? This seems to be a less than straightforward topic and something that is difficult to get right. I'm seeing multiple ways to attack such a system, but unable to come up with one that is secure enough to store highly confidential information.

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• Situations that require protecting files against tampering when stored on a users computer

  - by Joel

  I'm making a 'Pokémon Storage System' with a Client/Server model and as part of that I was thinking of storing an inventory file on the users computer which I do not wish to be edited except by my program. An alternative to this would be to instead to store the inventory file on the server and control it's editing by sending commands to the server but I was wondering if there are any situations which require files to be stored on a users computer where editing would be undesirable and if so how do you protect the files? I was thinking AES with some sort of checksum?

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• The 20 Best How-To Geek Explainer Topics for 2010

  - by The Geek

  It’s near the end of 2010, and we’ve put together a list of the 20 best “Explainer” articles of the year—where we answer a question and teach you a little more about the topic. Enjoy! Latest Features How-To Geek ETC How to Use the Avira Rescue CD to Clean Your Infected PC The Complete List of iPad Tips, Tricks, and Tutorials Is Your Desktop Printer More Expensive Than Printing Services? 20 OS X Keyboard Shortcuts You Might Not Know HTG Explains: Which Linux File System Should You Choose? HTG Explains: Why Does Photo Paper Improve Print Quality? Simon’s Cat Explores the Christmas Tree! [Video] The Outdoor Lights Scene from National Lampoon’s Christmas Vacation [Video] The Famous Home Alone Pizza Delivery Scene [Classic Video] Chronicles of Narnia: The Voyage of the Dawn Treader Theme for Windows 7 Cardinal and Rabbit Sharing a Tree on a Cold Winter Morning Wallpaper An Alternate Star Wars Christmas Special [Video]

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• How can I make the text cursor in X Windows easier to see?

  - by skyblue

  The text cursor in X Windows is too thin for me to see easily. It would be great if I could make the text cursor wider so that it was more visible. I know how to change the size of the mouse cursor in X by going to System Preferences Appearance and customizing the Pointer so that it is larger. But I have not been able to find any setting that allows me to alter the appearance of the text cursor. So how can I make the text cursor easier to see?

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• Dec. 6 Webcast: See the New UI for JD Edwards

  - by Theresa Hickman

  When: Dec. 6, 2011 Time: 8:00am PST What: Live webcast and demo Tune into this live webcast to see the just completed new JD Edwards EnterpriseOne User Interface. This is one of the most significant releases with a massive number of feature innovations for users and system administrators. We are looking forward to demonstrating the new User Interface and Tools. The following panel of experts will be available to answer all your questions: Lyle Ekdahl – Oracle Group Vice President Gary Grieshaber – Oracle Strategy Senior Director Brian Stanz – Oracle Development Senior Director Click here to register. Note: You must pre-register for this event.

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• Contract-Popup at Login

  - by Steve

  I want to give my notebook to guests of my little Hotel as an extra service. I love the Ubuntu guest-account and I think that this is the best possible way to help my guests get free internet-access. I found out how to "design" their user-accounts with /etc/skel, but unfortunately I have no clue, how to show them a small introduction to the system and a kind of user-agreement "contract" when they login. I read of xmessage, but this is too minimalistic. I'd like to implement some pictures. Does anyone have any idea of how to make this possible? Would it be possible that the user is logged out automatically if he rejects the user-agreement? Thank you so much in advance, Steve.

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• Can a partition table be edited from a LiveUSB of another architecture?

  - by Eliran Malka

  My purpose is to re-partition a dual-boot machine (running Ubuntu 13.04 / Windows 7), i.e. the current table is as follows: ----------------------------------------------------------- | | extended partition | | | windows |--------------------------------| recovery | | (NTFS) | swap | filesystem | (NTFS) | | | (swap) | (ext4) | | ----------------------------------------------------------- and I want to create an additional ext4 partition under the extended partition, and mount those (the one I created and the 'filesystem' partition) to root and home (/ and /home), such as the new layout will be: ----------------------------------------------------------- | | extended partition | | | windows |--------------------------------| recovery | | (NTFS) | swap | root | home | (NTFS) | | | (swap) | (ext4) | (ext4) | | ----------------------------------------------------------- As the installations on the system and on my Live USB differ in architecture, I want to know: Is it safe to use a 64bit GParted from a Live USB for partitioning a 32bit installation?

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• How to make xlock use the first key I hit as a part of my password

  - by alesplin

  I just switched from Arch Linux to Ubuntu 10.10. I'm running the Fluxbox window manager, and I use xlockmore to lock my screen with the following key shortcut: 192 :Exec xlock-mode marquee +usefirst -icongeometry 240x240 -message "back in a minute..." The problem I'm having is that xlock is definitely not using my first key as part of my password. Instead, it uses some randomized fade pattern to fade to the password screen. I find this highly annoying, as when I get back to my desk and start entering my password it doesn't register password characters until the fade pattern is complete. I've also tried the following modifications with no difference: 192 :Exec xlock -mode marquee -usefirst -icongeometry 240x240 -message "back in a minute..." 192 :Exec xlock -mode marquee -icongeometry 240x240 -message "back in a minute..." The first example worked flawlessly on Arch. Does Ubuntu have some sort of system default that you can't override on the command-line?

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• How to Use KeePass In Your Browser, Across Your Computers, and On Your Phone

  - by Chris Hoffman

  If you’re using a password manager and it’s not the cloud-based LastPass, it’s probably KeePass. KeePass is a completely open-source password manager that stores all your sensitive data locally. However, this means that it isn’t quite as well-integrated as other solutions. Want LastPass-style browser integration, the ability to synchronize your passwords and have them everywhere, and an app to access your passwords on your phone? You’ll have to string together your own system.    

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• How to Disable or Uninstall Android Bloatware

  - by Chris Hoffman

  Manufacturers and carriers often load Android phones with their own apps. If you don’t use them, they just clutter your system and sometimes in the background, draining resources. Take control of your device and stop the bloatware. We’ll be focusing on disabling – also known as “freezing” bloatware here. It’s a safer process than uninstalling the bloatware completely, and is also easier to accomplish with free apps. HTG Explains: Learn How Websites Are Tracking You Online Here’s How to Download Windows 8 Release Preview Right Now HTG Explains: Why Linux Doesn’t Need Defragmenting

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• How to partition my hard drive for Ubuntu use?

  - by Damir

  Till now I was windows user. From now on I want to use only Linux. I have 500Gb HDD. How do I partition it properly? I read that there is no right or wrong way, but still, I am confused. I did something and I have primary partition mounted on / (160Gb) which I believe is a OS and 350Gb extended partition of which I have 4Gb of swap and 346Gb mounted on /home. I got used to C:\ and D:\ partitioning, but I don't see file system in that way. I am lost. Where is what? How can I make C:\ partition for OS and D:\ for apps, movies, music, photos. Or what I want is Windows way and I have to get used to Linux way?

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• How to Root Your Android Device & Why You Might Want To

  - by Chris Hoffman

  You’ve probably heard of people “rooting” their Android phones. If you’ve ever wondered how to do that yourself – or wondered why people would bother – you’re in luck. You can root your Android in just a few minutes. After rooting your device, you have full access to the entire system and can run special types of apps that require root permissions. These apps can disable bloatware, control app permissions, enable tethering, and do lots of other cool things. HTG Explains: Why Linux Doesn’t Need Defragmenting How to Convert News Feeds to Ebooks with Calibre How To Customize Your Wallpaper with Google Image Searches, RSS Feeds, and More

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• Adaptive Characters: AI Solution Needs a Problem

  - by Roger F. Gay

  Have sophisticated adaptive programming, will travel - so to speak. I'm part of a group that developed sophisticated learning / adaptive software for robotics. The system "thinks" via its simulator, building and adapting code on its own; and then carries out the best solution. The software can also adapt to new situations, etc. http://mensnewsdaily.com/2007/05/16/robobusiness-robots-with-imagination/ It's easy to imagine using it with automated game characters that will adapt to the players moves and style - the easiest example would be fighting. The more the simulated fighter fights with the human player, the more it learns to counter that players fighting skills. But there should be more. Anyone have any ideas as to how adaptive characters might be interesting in games?

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• Ubuntu partitions on Dell XPS13

  - by Francois

  I bought a Dell XPS13 with ubuntu 12.04 pre-installed. I want to reformat and repartition the machine but as I'm far from being a linux guru, I'm afraid to erase something important that could have been preinstalled by Dell. On the disk, there are 3 partitions: /dev/sda1 - Ext4 Linux bootable 248GB - witch is the system+user partition I guess, /dev/sda2 - Extended (?) of 8GB - What is this partion about? /dev/sda5 - Linux Swap of 8GB - whitch is for RAM and need to be reconduct (why only 1xRAM and not 2?) Do I have to care about /dev/sda2 ? According to you can I reformat to create a partition for /home whitout losing anything important (except user data of course) ? Thank you for your help

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• How to reboot into Windows from Ubuntu?

  - by andrewsomething

  I'm looking for a way to reboot into Windows from Ubuntu on a 10.10/Vista dual boot system. The specific use case is that I would like to be able to ssh into my running Ubuntu instance and issue a command that will initiate a reboot directly into Windows. I found a promising blog post, but the script that it suggests isn't working: #!/bin/bash WINDOWS_ENTRY=`grep menuentry /boot/grub/grub.cfg | grep --line-number Windows` MENU_NUMBER=$(( `echo $WINDOWS_ENTRY | sed -e "s/:.*//"` - 1 )) sudo grub-reboot $MENU_NUMBER sudo reboot man grub-reboot isn't much help, but it seems to be leading me in the right direction: set the default boot entry for GRUB, for the next boot only WINDOWS_ENTRY=`grep menuentry /boot/grub/grub.cfg | grep --line-number Windows` MENU_NUMBER=$(( `echo $WINDOWS_ENTRY | sed -e "s/:.*//"` - 1 )) echo $MENU_NUMBER This returns the expected value, but on reboot the first menu entry is still highlighted. Any ideas why this isn't working or suggestions for other solutions?

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• Finding Near-Earth Asteroids

  - by TATWORTH

  One of the puzzling aspects of hunting for Near Earth Asteroids is that more has been spent on Hollywood films about potential disasters should one hit the Earth than on finding them in the first place. While there are a number of on-going asteroid search programs, these are all Earth-based at the moment. The limitations of them are:Each telescope can only observe for a maximum average of 12 hours per day.As far as I am aware, all these programs are in the visible light only. (Once an asteroid is found, then radar tracking is possible when it is close.)Being Earth based they cannot see inside the Earth's orbit.The Asteroids being generally dark, do not show up well in visible light.A private group are proposing a radical alternative to this by orbiting an infra-red telescope in the orbit of Venus. In Infra-red, the asteroids are more readily seen. Here are some details: Source SPACE.com: All about our solar system, outer space and exploration

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• Can't adjust brightness on a Sony Vaio T13 ultrabook

  - by Alex Barreira

  I recently installed Ubuntu 12.04 alongside Windows 7 in a Vaio T13 ultrabook. I cannot use the the Fn+F4 or Fn+F5 to change the brightness. The bubble appears indicating that brightness is being changed but with no visual impact on the screen. I've tried many solutions involving the manipulation of the /etc/default/grub file but none of them worked. Whenever I tried this manipulation the screen still didn't change, however the bubble stopped functioning properly. This is not a problem of the Fn shortcut. Even when I try to change it in the Brightness and Lock on System Settings, the bar does scroll but the screen remains unchanged. Does any one has a way around this mystery?

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• How In-Memory Database Objects Affect Database Design: Hybrid Code

  - by drsql

  In my first attempts at building my code, I strictly went with either native or on-disk code. I specifically wrote the on-disk code to only use features that worked in-memory. This lead to one majorly silly bit of code, used to create system assigned key values. How would I create a customer number that was unique. We can’t use the Max(value) + 1 approach because it will be very hideous with MVCC isolation levels, since 100 connections might see the same value, leading to lots of duplication. You...(read more)

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• Castle Windsor Dependency Injection with MVC4

  - by Renso

  Problem:Installed MVC4 on my local and ran a MVC3 app and got an error where Castle Windsor was unable to resolve any controllers' constructor injections. It failed with "No component for supporting the service....".As soon as I uninstall MVC4 beta, the problem vanishes like magic?!I also tried to upgrade to NHibernate 3 and Castle and Castle Windsor to version 3 (from version 2), but since I use Rhino Commons, that is not possible as the Rhino Commons project looks like is no longer supported and requests to upgrade it to work with NHibernate version 3 two years ago has gone unanswered. The problem is that Rhino Commons (the older version) references a method in Castle version 2 that has been depreciated in version 3: "CreateContainer("windsor.boo")' threw an exception of type 'System.MissingMethodException."Hope this helps anyone else who runs into this issue. Btw I used NuGet package manager to install the correct packages so I know that is not the issue.

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• How to replace GRUB with BURG without overwriting MBR?

  - by StepTNT

  I'd like to install BURG but I don't want it to overwrite my MBR. That's because I've got two bootloaders in my system : Default Windows 7 in MBR Grub in /dev/sda2 With the first power button, it will boot into Windows and with the second button it boots from /dev/sda2, loading Grub and then Kubuntu. Now I want to replace GRUB with BURG. I've installed Burg with burg-install /dev/sda2 --force because I don't want my MBR to be overwritten (pressing the first power button MUST load Windows and avoid showing any sign of Linux). Setup was completed without errors, If I open burg-manager it loads my settings, allowing me to change them and to test everything with burg-emu, so I've changed my settings but the second power button still loads GRUB (Even a different version from the default Kubuntu one). How can I replace GRUB that's on /dev/sda2 with BURG and without overwriting MBR?

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• Can't get Optimus to work with Ironhide on an Asus N53SN

  - by Musaab

  I installed Ubuntu 11.10 (Same issue in 11.04 btw) and then I installed Ironhide. I went through the configuration, chose the one with the highest confirmation for my system and tested it: > Error: Module nvidia does not exist in /proc/modules > P50 Disabling nVidia Card Succeded (the spelling error is theirs) And it changes nothing. I tried other configurations and got worse results. This has really become a major headache. Any solutions?

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• Interfacing the payment systems

  - by etranger

  Hello all. I'm a complete newbie to using online payment systems for web projects, and can't really think of where to start. Let's assume that web system in question needs to generate some income online, and the business idea/functionality is in place, while organizing cash flow is the only unsolved problem. Points of interest are how the custom developed software interfaces to payment systems, and how the resulting income is available to the owner. I do understand that there are probably hundreds of systems out there, but to be more specific on which of them suit, I'd have to know how they work, and that's where I don't feel like understanding much. Thanks in advance.

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• How much should I charge for a web app

  - by Kostas

  I am a freelance web developer and I am working on a PHP/MySQL/Javascript based project. It's a web app that uses a custom CMS with user types, followers system, search forms, blogs, social integration. It will take about 3 months to finish, according to a roadmap I make (based on current development stage) and about a month after that for bug fixing and testing. So I have to tell them a price. What price range you think it's appropriate?? (It's a good regular client, so I want something reasonable) Can you give me some ideas?? Thanks.

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