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• Computer won't wake from hibernate

  - by Icoo

  So I have a pretty dumb problem...I accidentaly pressed Hibernate while trying to Restart...since then my computer wont boot into Ubuntu anymore (through normal mode or single user mode - rescue mode that is)...all I get is: mount: mounting /dev on /root/dev failed: No such file or directory mount: mounting /sys/ on root/sys failed: No such file or directory mount: mounting /proc on /root/proc failed: No such file or dirctory Target filesystem doesn't have requested /sbin/init. No init found. Try passing init= boot arg. BusyBox v1.15.3 (Ubuntu 1:1.15.3-1ubuntu5) built-in shell (ash) Enter 'help' for a list of built-in commands. (initramfs) Obviously I tried to fire up the Live CD and run fsck (or e2fsck) from there (or just try to do a Check of /dev/sdb1 my partition via gparted - which is basically the same thing). But it doesn't allow me...both gparted and fsck say that the device is busy (I can't even mount it in the LiveCD to rescue data)...umount /dev/sdb1 says its not mounted...any ideas?

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• What techniques can I use to render very large numbers of objects more efficiently in OpenGL?

  - by Luke

  You can think of my application as drawing a very large ball-and-stick diagram (or graph). At times, this graph can get very large, where the number of elements even outnumbers the pixels on the screen. Currently I am simply passing all of my textures (as GL_POINTS) and lines to the graphics card using VBO's. When the number of elements outnumbers the number of pixels, is this the most efficient way to do this? Or should I do some calculations on the CPU side before handing everything over to the GPU? If it matters, I do use GL_DEPTH_TEST and GL_ALPHA_TEST. I do some alpha blending, but probably not enough to make a huge performance difference. My scene can be static at times, but the user has control over a typical arc-ball camera and can pan, rotate, or zoom. It is during these operations that performance degradation is noticeable.

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• what is the Best way to learn object oriented principles

  - by Mike

  I am interesed in OOP principles and i found lots of documentations and books about it, for instance in C++, Java, .NET, PHP and so on, but if i only want to learn OOP principle, differences and not in language, what can i do? i want a good documentation, not just like a whole book about something except OOP :) specific answers, how it works, main features, pictures, or videos, or forum, or even stack... in every time I began studying i read a whole history of programming, computer science, software development and bla bla... i need specific answers, if it is possible i really need to learn, i need examples and exercises thanks in advance

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• How can I motivate the community to use boinc?

  - by user49523

  boinc is a really nice application to use on background of a computer that can help science projects and humanity as a all. I would like somehow to encourage people use boinc with their preferences on boinc like projects choice, cpu from 10 to 100 ,.. with their computer that will help science to move more quickly and help humanity There are 20 million users of ubuntu if most of use boinc , this will increase the speed of science projets .. and if other people from other operating systems use as also like mac,windows,.. and other open source like debian,.. this would even speed more science and now anyone can win also a prize , joining a project management like http://boincstats.com/ and there is more 2 How can i get ubuntu users and ubuntu community to know and use boinc application?

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• Ubuntu 12.04 won't boot at all for the first time

  - by user76280

  Using http://www.ubuntu.com/download/desktop/windows-installer So I tried installing Ubuntu for the first time today, and it installed all well, but then it froze at the 'Preparing to run Ubuntu for the first time...' screen. I then proceeded to restart my computer and load Ubuntu from the OS selection screen. My screen completely froze and the picture didn't even come up fully as if my video driver was not installed correctly. Are there any fixes to this problem? Would greatly appreciate it. Possible useful information: Using http://www.ubuntu.com/download/desktop/windows-installer Dual-booting with Windows

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• How to clean launch a GUI app via the Terminal (so it doesn't wait for termination)?

  - by Peter.O

  Some GUI apps launch cleanly via the Terminal command line. Some don't, and they cause the Terminal to wait for the app to terminate. ...and even then, some don't "release" the command line. The mysterious ampersand "&" suffix, seems to cause the terminal to put the process into the background... (but I'm not sure what happens there). Is there a way to launch an app via the Terminal, so that there is no "hang on" effect? ... just like launching something via F2. I'd like to have the command line available again, immediately (without something still in the background and writing out system message in the terminal).

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• Is there an effective way to test XSL transforms/BizTalk maps?

  - by nlawalker

  Creating repeatable tests for BizTalk maps is frustrating. I can't find a way to handle testing them like I'd do unit testing, because I can't find ways to break them into logical chunks. They tend to be one big monolithic unit, and any change has the potential to ripple through the map and break a lot of unit tests. Even if I could break it up, creating XML test inputs is painful and error prone. Is there any effective way of testing these? I'd settle for recommendations for testing XSL transforms in general, but I specifically mention BizTalk maps primarily for the reason that when using the mapper, there really isn't any way to break your XSLT into templates (which I'd imagine you could use to break up your logic into testable chunks, but I've honestly never gotten that far with XSLT).

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• Xubuntu and other Debian based distros slow

  - by William V

  I have a Compaq Presario SR1950NX desktop computer with the AMD64 3800+ processor and 1GB ram and it seems that Ubunutu, Xubuntu and Lubuntu are all laggy. Things seem to be slow such as clicking on menus and opening programs and the UI renders in peices. When using the browser the system slows down considerably. I ran the TOP command and I do notice that xorg hits 30 to 40 percent cpu when running the browsers. I have tried these distros on a spare P4 machine and it is even worse. As long as I don't have a several things open at one time I can manage to get around although sluggishly. I also notice that I can't get debian based distros to install in 64bit (crtc6 failure) only in 32bit. Can anyone tell me what is it that I might be doing wrong? I have an integrated Nvidia card and have tried several of the recommended drivers which sometimes result in no boot screen upon reboot. Thanks

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• Replace broken image with noimage icon using Jquery

  - by hmloo

  Sometimes when the image isn't available on server, the web page will show a broken image. so we can display a "no image available" image for good user experience. I will implement it using Jquery. $(document).ready(function() { $("img").error(function() { $(this).hide(); }) .attr("src", "noimage.jpg"); }); Please note that we must first hide the broken image, or else even if we set the src to noimage, it still can not show  noimage icon.

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• Can GJK be used with the same "direction finding method" every time?

  - by the_Seppi

  In my deliberations on GJK (after watching http://mollyrocket.com/849) I came up with the idea that it ins not neccessary to use different methods for getting the new direction in the doSimplex function. E.g. if the point A is closest to the origin, the video author uses the negative position vector AO as the direction in which the next point is searched. If an edge (with A as an endpoint) is closest, he creates a normal vector to this edge, lying in the plane the edge and AO form. If a face is the feature closest to the origin, he uses even another method (which I can't recite from memory right now) However, while thinking about the implementation of GJK in my current came, I noticed that the negative direction vector of the newest simplex point would always make a good direction vector. Of course, the next vertex found by the support function could form a simplex that less likely encases the origin, but I assume it would still work. Since I'm currently experiencing problems with my (yet unfinished) implementation, I wanted to ask whether this method of forming the direction vector is usable or not.

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• How to make a minimal upgrade?

  - by wajed

  I use apt-get install --no-install-recommends ubuntu-desktop to install minimal desktop. I want to upgrade my system to the latest version (12.04) with it still being minimal. How do I do that? What I tried:- I tried Update Manager, and it gave me the Option to upgrade to 11.10 first, then to 12.04. What happened after I upgraded to 11.10 is that my desktop got bloated, and instead of the system using 500MB of RAM, now it uses about 1.5GB I can't even start apps anymore.

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• Startup applications 14.04

  - by gpalthrow

  I'm trying to mount 3 partitions by default when I log in. I used to do that with the start up applications in 12.04 However there seems to be a nasty bug in 14.04 where false command duplicates are removed (apparently, only the command is taken into account, even if the arguments differ). I tried using one single command instead of 3, putting all the devices in one line (something like /usr/bin/udisks --mount /dev/sdb1; /usr/bin/udisks --mount /dev/sdb2; /usr/bin/udisks --mount /dev/sdb3; ) However it does not seem to work either. What can I do to have 3 partitions mounted by default (with their label) ?!

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• Developer Deep Dive into Oracle WebLogic Server 12c (Dec. 1)

  - by oracletechnet

  It is not often that we are compelled to direct you toward a product launch event. But this one is special. On Dec. 1, Oracle will launch (via live Webcast) Oracle WebLogic Server 12c, a major update to that product. And this release, which includes Java EE 6 support, Active GridLink for Oracle RAC, and Oracle Virtual Assembly Builder, among other things, is specifically designed to improve the process of deploying apps to the cloud. Even better: the Dec. 1 Webcast includes an hour-long, developer-focused deep-dive session in which product experts will answer your questions via live chat. (Register for this session separately.) You don't want to miss this one, folks! 

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• YouTube fullscreen not displaying

  - by pt2ph8

  For some reason YouTube videos in my website do not get the fullscreen button, even if I added the parameter allowFullScreen set to true both in the object and embed tag. Here's an example page: http://www.indievault.it/2011/11/09/indie-vault-alla-games-week-2011-online-la-video-gallery/ Just take a quick look at the source. The allowFullScreen param is there, but the button won't show. Here's an excerpt from the code in that page: <object width="540" height="325"><param name="movie" value="http://www.youtube.com/v/dvYQhJwwkgA"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/dvYQhJwwkgA" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="540" height="325"></embed </object>

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• How do I get a Broadcom BCM4313 wireless card working?

  - by viky

  I upgraded Ubuntu from 11.10 to 12.04, until which wireless was working just fine. After the upgrade and reboot, wireless is not even being detected (When I click the network manager icon in the top panel, it does not show the wireless networks. Neither the Enable wireless option is there). But my laptop's LED indicator shows wireless is on. This is a Dell Vostro 3450 laptop with: Broadcom Corporation BCM4313 802.11b/g/n Wireless LAN Controller (rev 01)** (from lspci). Is any other info needed? How do I get Wifi working?

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• Missed question in technical phone interview and the follow up letter

  - by Jacob

  I may have just bombed a C++ technical phone interview. The interviewer asked mostly about data structures and I was able to go into detail about each of the data structures he asked about. Score one for me I'm thinking. Wrong. Then he asks to join me on a collaboration website where he can see what I am typing. This was the same process as interview #1 which went well, not perfect, but well. So the question was: How do you reverse a linked list? he gave a function prototype similar to Node *reverse(Node *head) I struggled with this for about 10-15 minutes until the hour was up. I was able to get the general idea across but was not able to reverse the link list. My question is that after remembering the answer post interview do I mention this in the thank you letter, if I even should write one?

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• Download a file over an active SSH session

  - by Oli

  So I'm SSHed into my Ubuntu server from my Ubuntu desktop. I'm at a certain path and I want to download a file to my local filesystem (preferably the path I was at before I entered the SSH session). I could mount SSH and pull the file across by mouse but what if I was trying to get a root file and logging in by root directly is disallowed? Even if that wasn't the case (it isn't now), surely there must be a simple way of pulling back a file over an active SSH connection. Surely!

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• Is it possible to save output from a command to a file subsequent the command already has been executed?

  - by NES

  Does an elegant way exists to save the output of a command subsequent to a file as long as the terminal window is open? I mean once the command has been executed in the terminal. The output is still there in terminal. Now i could copy & paste all the lines and save it to a file. But perhaps does a method exist to somehow write the output buffer of a terminal window to a file or even better the output of an already executed command?

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• How do I compile ndiswrapper?

  - by Aphrodite

  I have been working for a good 2 days now trying every forum post i could find when it comes to ndiswrapper. I can get it installed but get the error module ndiswrapper not found keeps coming up. In my travels, this is a bug in the installer and I have to build it from source. I have no clue how that works... Is there anyone out there that can give me an idea of where to start? I don't even know where to begin... Thank you in advance!!!

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• Algorithm to generate N random numbers between A and B which sum up to X

  - by Shaamaan

  This problem seemed like something which should be solvable with but a few lines of code. Unfortunately, once I actually started to write the thing, I've realized it's not as simple as it sounds. What I need is a set of X random numbers, each of which is between A and B and they all add up to X. The exact variables for the problem I'm facing seem to be even simpler: I need 5 numbers, between -1 and 1 (note: these are decimal numbers), which add up to 1. My initial "few lines of code, should be easy" approach was to randomize 4 numbers between -1 and 1 (which is simple enough), and then make the last one 1-(sum of previous numbers). This quickly proved wrong, as the last number could just as well be larger than 1 or smaller than -1. What would be the best way to approach this problem? PS. Just for reference: I'm using C#, but I don't think it matters. I'm actually having trouble creating a good enough solution for the problem in my head.

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• Restricted Flow Of Power

  - by user13827

  I'm sure all is fine, but i need some reassurance. Last month my company launched consolidated two of their websites into one new website. www.fdmgroup.com and www.fdmacademy.com into a newly designed www.fdmgroup.com. Because the FDM Academy grew as it's own brand we decided not to just forward the domain to the fdmgroup website, but instead just mirror the new FDM Group website and use a canonical tags to the FDM Group domain (so the link juice will pass to the FDM Group domain pages) The website has be live for nearly a month and i don't believe any power has passed down through the FDM Group website to it's deeper pages even though 301 redirects from the legacy group and academy domains in place. I am also seeing the same problem on the FDM Academy domain, but i expect to see this as every page has a canonical to the same page on the Is there anything which is restricting the flow of power through the site, or am i just being impatient. Thanks in advance Jon

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• 301 redirect to 404 page?

  - by Kristian

  Currently i'm migrating www. prefix from my urls and use htaccess to do the job. Since we have new software and cleaned database some of the old urls doesnt exists anymore. Therefore some requests redirect to 404 page. 1. www.domain.com/old-page # htaccess redirect to non-www url, 301 2. domain.com/old-page # page does not exists, 404 Does this method have any SEO issues, or even affect pagerank? Or should i check the page existence before redirecting and show 404 without redirect?

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• Web App for storing and organize programming information?

  - by Fabzter

  So, I've found myself, after several years of coding (I consider myself a coder, rather than a programmer) full of links and loose snippets and coding tips, all dispersed across the web. In such way it is barely usable, even when every bit is important or interesting. I thought of simply storing the links in delicious or something alike, but it's not really the links I want to keep, I just need the succinth info. So I was thinking to use some web app, something like a wiki, maybe much more simple, so I could access it though my mobile if I need it. I could code it, but as I stated it before, I'm more of a code monkey, and I'm sure my solution would be far from decent... Can anyone give me recommendations on this?

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• Free serif font with clearly distinguishable 0 (zero) character

  - by l0b0

  I'm using gLabels to create some small pieces of paper to give away to people - Just two lines of about 15-20 characters each. One of the important parts of the design is that there are no "o" ("oh") characters, but there are "0" ("zero") characters in an all-lowercase URL. Therefore I need a non-monospaced (and very legible in print) font where "0" cannot be confused with "o" even without reference. The closest thing I've found so far is Andale Mono and Inconsolata , but they are both monospace, and as such not very easy to read in print. Alternatively, to find a font myself, is there some way to preview all fonts in the Ubuntu repositories without installing them?

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• Interface design where functions need to be called in a specific sequence

  - by Vorac

  The task is to configure a piece of hardware within the device, according to some input specification. This should be achieved as follows: 1) Collect the configuration information. This can happen at different times and places. For example, module A and module B can both request (at different times) some resources from my module. Those 'resources' are actually what the configuration is. 2) After it is clear that no more requests are going to be realized, a startup command, giving a summary of the requested resources, needs to be sent to the hardware. 3) Only after that, can (and must) detailed configuration of said resources be done. 4) Also, only after 2), can (and must) routing of selected resources to the declared callers be done. A common cause for bugs, even for me, who wrote the thing, is mistaking this order. What naming conventions, designs or mechanisms can I employ to make the interface usable by someone who sees the code for the first time?

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