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• How to make LBP-1120 Canon printer work?

  - by cipricus

  Initially this question was limited to 11.10. Now I am in (Lubuntu) 12.10. (On the changes in the question see this meta question). Considering 11.10 I have tried different (or not so different) approaches - that also other users commented here. My main references were: the ubuntu official documentation website on the LBP Canon driver package, this Unixmen solution which partly refers to Radu Cotescu script that aims at providing a near-automated install, and an updated by Unixmen version of that very script (download here). None worked for me.

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• Text box select issue

  - by Kent Boogaart

  I have this issue where the entire text in text boxes is selected whilst I'm typing in it. For example, in FireFox search box I'd try to type "foo" but end up with "o" because I managed to type "fo" before everything was selected, and then typed "o" which replaced the "fo". When it happens, it is incessant - not just a one-off. But it doesn't happen all the time, and I haven't managed to figure out what causes it to start and stop. Is this a known problem with an easy solution? EDIT: this has nothing to do with touchpad. I get this occasionally even on a machine without one. I can usually rectify the issue just be alt-tabbing about a few times.

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• Efficient way of detecting a touched object in a game?

  - by Pin

  Imagine a Sims-like 2D game for a touch based mobile phone where one can interact with virtually any object in the scene. How can I efficiently detect which object is being touched by the player? In my short experience, looping through all the visible objects in the scene and checking if they're touched has so far done the job, but when there may be many many moving objects in the screen that sounds kind of inefficient isn't it? Keeping the visible moving objects list can consume time in itself as one may have to loop through all of them each frame. Other solutions I've thought are: Spatial hashing. Divide the screen as a grid and place the visible objects in the corresponding bucket. Detection of the clicked object is fast but there's additional overhead for placing the objects in the correct bucket each frame. Maintaining a quad-tree. Moving objects have to be rearranged all the time, the previous solution looks better. What is usually done in this case?

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• Run Java application as a different user [on hold]

  - by Harihar Das

  I need to run a few perl scripts from a Java GUI application. I am using Runtime API to do that. However, few of the perl scripts need to run under a specific user account to have special credentials to access specialized resources (e.g. Database, Files). I have heard of alleviating user access using UAC. But till now I am not able to find the solution. Please help me on how to run a process under a different user login. Is there anything similar to c# impersonization in Java?

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• Microphone problem in Ubuntu 11.10

  - by Teja

  I am using both Windows 7 and Ubuntu 11.10 on a single system with the same hardware. While I'm making call through Gmail or Skype my voice is audible to others while I'm on Windows 7, but while I'm on Ubuntu 11.10 it's not audible to others, but I am able to hear their voice. But while I'm playing music on Ubuntu along with a call, the others are able to hear the music, but my voice is not audible for them. Please give me a solution for this and tell me where I can change the microphone settings on Ubuntu 11.10.

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• Avoiding orbiting in pursuit steering behavior

  - by bobobobo

  I have a missile that does pursuit behavior to track (and try and impact) its (stationary) target. It works fine as long as you are not strafing when you launch the missile. If you are strafing, the missile tends to orbit its target. I fixed this by accelerating tangentially to the target first, killing the tangential component of the velocity first, then beelining for the target. So I accelerate in -vT until vT is nearly 0. Then accelerate in the direction of vN. While that works, I'm looking for a more elegant solution where the missile is able to impact the target without explicitly killing the tangential component first.

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• How can I permute pairs across a set?

  - by sila

  I am writing a bet settling app in C# and WinForms. I have 6 selections, 4 of them have won. I know that using the following formula from Excel: =FACT(selections)/(FACT(selections-doubles))/FACT(doubles) This is coded into my app and working well: I can work out how many possible doubles (e.g., AB, AC, AD, AE, BC, BD, BE, etc.) need to be resolved. But what I can't figure out is how to do the actual calculation. How can I efficiently code it so that every combination of A, B, C, and D has been calculated? All my efforts thus far on paper have proved to be ugly and verbose: is there an elegant solution to this problem?

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• 6 Steam Troubleshooting Tips

  - by Chris Hoffman

  Steam is generally pretty stable, but every now and then you’ll run into a problem. This guide gives solutions to common problems you’ll encounter in Steam, from games crashing or not working properly to Steam failing to launch. If none of these solutions helps, try Googling the problem – you may have run into a game-specific problem with a game-specific solution or just a more obscure Steam bug. HTG Explains: What Is RSS and How Can I Benefit From Using It? HTG Explains: Why You Only Have to Wipe a Disk Once to Erase It HTG Explains: Learn How Websites Are Tracking You Online

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• Ubuntu 12.04LTS loads straight to terminal!! startx doesn't work!

  - by user293256

  I have been using ubuntu 12.04LTS for last few months, and now suddenly something has happened to it. As a result, terminal opens on every start up when I login . Although, if i login as a guest, it works fine. I have already used startx command, and tried reinstalling the desktop as well but it doesn't work! If I use ctrl+alt+f9, terminal screen vanishes and a black screen appears, and then nothing happens after that. ctrl+alt+f1 takes me to the command prompt. I know similar questions have been asked here, but i could not find a solution for my laptop. Please help!!

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• Is it safe to set FPS rate to a constant?

  - by Ozan

  I learned from game class that in update function, every movements must be time dependent for the sake of linearity in movement. We made a simple game. Every move like going left, right or jump is written time dependent. But, in some other computers, our game is worked very differently. For example, our character jumps higher than it should be. I guess this is because each computer has different FPS rate according to its specification. My question is that what should we do to make this game work in same way in every computer? Setting FPS rate to a constant is a solution?

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• User script at logout

  - by GUI Junkie

  The problem: I'm sharing a directory with my wife. I've placed us both in a 'shared' group and the directory belongs to the 'shared' group as well. Whenever one of us creates a file, this file belongs to user:user, instead of user:shared... The solution: I can do sudo chown, but my wife can't. So, I want to run a script when I logout of the session. If I understand correctly, the startup scripts go in /etc/init.d/ and the runlevel scripts go /etc/rc0.d/ where 0 is the runlevel (0-6). Do the runlevel scripts execute only on exit/logout? Do these depend on the user, that is, I'd like to run it only for my user (not so important in this case, mind)? Should I place the script somewhere else? Also, I imagine that the script will be run by root, so there's no need for sudo within the script, is that correct?

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• Compiz window decorator randomly disappears

  - by adjfac

  I know people have posted this problem before such as http://askubuntu.com/users/authenticate/?s=9b515fe8-5da2-4bb9-ba01-dcea538b9b9c&dnoa.userSuppliedIdentifier=https%3A%2F%2Fwww.google.com%2Faccounts%2Fo8%2Fid&openid.mode=cancel&openid.ns=http%3A%2F%2Fspecs.openid.net%2Fauth%2F2.0 but i am looking for a more permanent solution right now. It happens to me at least once a day and when that happens, I usually go to compiz, uncheck and check window decorator and it will bring it back. But it's sort annoying and just wonder if there is a permanent fix out yet? I am using gnome (not unity), on a bran-new thinkpad t520.

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• How to reload Variety wallpaper changer?

  - by mayur

  I have installed Variety desktop wallpaper changer. Its a good app. But sometimes when I start Ubuntu and login to my account it fails to load. I try to manually start the app by clicking on variety icon, but doesnt work. I tried alt+F2 and enter 'killall gnome-panel' but nothing seems to happen. I checked in my startup applications window, variety is present there to start when Ubuntu starts. but then why it does not start always? Restarting my pc is the only solution then. Is there a way that I can reload Variety without logging off or restarting Ubuntu? Thanks in advance.

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• Sharing ideas without risk of leaking

  - by eversor

  As freelancers, we meet somewhere and chat about a new idea for a project, brainstorm etc. Up to this point, we have taken notes of the ideas, but we would like to be able to share more efficiently the ideas with each other. However, I fear that if I use some online product (such as Google Docs) these ideas could be seen by people outside the team (employees of the company of the online product, other users...). I am not sure if I am being a little Paranoid parrot... One solution that we have considered is to install a Subversion with just one ideas.txt. But that would require a server in one of our houses, which is a little unconfortable. So how do you share your ideas for a new project with your team without risking the ideas to be stolen?

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• Wireless Very slow with 13.10 and BCM4313

  - by RyanCheu

  I have a laptop with the BCM4313, and it was working perfectly in Ubuntu 13.04, but I recently upgraded to 13.10 and now my wireless performance is horrible. Initially it didn't work at all, but I removed the wl driver and use the brcmsmac driver instead. Now when I boot up it works at the start, but gets progressively slower. My Android device is reporting 10Mbps down/20Mbps up, but my laptop only gets 1up/down. Does anyone know a solution? I really need my wireless to work, is my best option to just reinstall on 13.04? Thanks!

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• New customer references for Exadata-based projects

  - by Javier Puerta

  Milletech Systems, Inc. shows a large state university how to improve query response times 15-fold using its grant management solution built on Oracle’s Extreme Performance Infrastructure. Read More. Ação Informática helped Valdecard realize a 15-Fold Improvement in Fleet-Management and Benefit Card Data Processing using Oracle Exadata Machine. Read More. Neusoft deployed Benxi Municipal Human Resources and Social Security Bureau’s cloud-based database platform to process social insurance payments 50-times faster using Oracle Exadata Database Machine. Read More.

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• Dell Vostro 1510 trackpad

  - by user18055

  A week ago I moved totally from Windows 7 to Ubuntu. I've been really happy with the transition bar one annoying glitch. My trackpad sometimes works, sometimes doesn't. All other hardware including peripherals work flawlessly, including a Logitech ball mouse, Wacom Bamboo pen and touch and wireless Logitech keyboard and mouse combo. I can't see any pattern to when and why the trackpad works. Occasionally on rebooting, it will work, but then I can reboot 10x in a row and it won't work, then I leave it a day, then reboot and it works flawlessly. Any ideas on a solution or appropriate method for me to deb it? My knowledge of Ubuntu/Linux is sketchy at best so I could do with a little help :)

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• DRY, string, and unit testing

  - by Rodrigue

  I have a recurring question when writing unit tests for code that involves constant string values. Let's take an example of a method/function that does some processing and returns a string containing a pre-defined constant. In python, that would be something like: STRING_TEMPLATE = "/some/constant/string/with/%s/that/needs/interpolation/" def process(some_param): # We do some meaningful work that gives us a value result = _some_meaningful_action() return STRING_TEMPLATE % result If I want to unit test process, one of my tests will check the return value. This is where I wonder what the best solution is. In my unit test, I can: apply DRY and use the already defined constant repeat myself and rewrite the entire string def test_foo_should_return_correct_url(): string_result = process() # Applying DRY and using the already defined constant assert STRING_TEMPLATE % "1234" == string_result # Repeating myself, repeating myself assert "/some/constant/string/with/1234/that/needs/interpolation/" == url The advantage I see in the former is that my test will break if I put the wrong string value in my constant. The inconvenient is that I may be rewriting the same string over and over again across different unit tests.

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• can not get Toshiba tv to full resolution

  - by Tloc2077

  I have a 23inch Toshiba model#23L1350U that I am using as a computer monitor via VGA plug; it is a full 1080P resolution TV but in Ubuntu it shows up as a Toshiba 72inch Television and wont go past the resolution 1366 by 1768. Has anyone came up with a solution to this problem..I used to get full 1080 resolution with my Insignia 32 inch TV so I know my hardware can push the signal, I am running a Radeon x1550 graphics cars 3200+ processor on a 756 chip set 64bit version of Ubuntu 13.04 your help is greatly appreciated and you may or may not be compensated for your time

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• Level Representation in a 2D Game

  - by meszar.imola

  I would like to create a 2D game, where a character should move on a stage/level. My stage would be static, constructed some little cubes, similar to the well-known Mario game: some of the elements should represent an element of the way where the character can step, but if the element is missing, the character should fall. My problem is, how to represent this programmatically? My first thought was to represent the stage with a vector, which should contain boolean elements, depending on the state of the element on the stage - if it's missing or not. But this means, I have to verify at my character's x or y position change if it has a stage element under or not (if not, to simulate the falling of the character) - I think it is not the best practice, it's not the beautiful solution. Can you help me with some advice, how to represent the stage?

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• What is the traditional way to maintain extensibility in a database-driven application like this?

  - by Jsess

  I'm working on a simple application for a game in Java that allows a user to record whether they have collected a given item and how much experience it contains. This will work for multiple item types (weapons, armor) and each will have its own tab with a list of all items that qualify under it. Making changes as new types are added is not such a big deal (if a clothing slot is added, for instance), but new items are added to the game all the time in biweekly patches, and I'm not sure what the traditional/customary way to make sure the application is user-extensible without requiring me to would be. Whether that would be adding a configuration menu that allows users to add news items (new rows to the local SQLite database) or a text file with something similar, but I'm certain there's a well-accepted way to do this that I'm not aware of. I'm new to databases and ignorant of the solution, so what's the professional/futureproof way to do this?

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• eSeminar ISV Partner Update: High Quality Reporting for Your Applications

  - by Mike.Hallett(at)Oracle-BI&EPM

  Play eSeminar Duration: 18 Minutes         Description: This webinar presents to ISV Partners Oracle’s latest release of BI Publisher, and describes how this tool can make their applications more competitive and appealing to their customers by providing High Quality Reporting and Business Intelligence embedded into their solution. • BI Publisher can Provide All Reports… at Lower Cost • Easier, with Better Developer Productivity • Better Managed : Better Performance, Less Administration • Highest Quality : Pixel Perfect and Interactive Reporting. Play eSeminar (Only accessible to Oracle Partners).

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• Sortie de WINDEV 17 avec 917 nouveautés, l'EDI permet à présent de développer des applications iPhone et iPad

  Sortie de WINDEV 17 Avec 917 nouveautés, « la solution rêvée pour développer des applications iPhone, iPad » affirme PC SOFT PC SOFT vient d'annonce la version 17 de WINDEV avec 917 nouveautés. Parmi celles-ci, WINDEV Mobile génère à présent des applications professionnelles natives pour iPhone et iPad en plus de Windows et d'Android. Au niveau du déploiement, le choix est possible soit via l'AppStore, ou la méthode Ad Hoc Distribution ou encore en in-House Distribution. « WINDEV Mobile permet de diffuser des applications portables sous iOS, Windows et Android tout en programmant avec un code unique », explique l'éditeur. « Là où, sans WINDEV, il est...

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• Issues with nVidia GeForce 210 while watching movies

  - by David ???

  Ever since 10.04 I have been trying to resolve an issue with my graphics card - nVidia GeForce 210. I'm having issues when I watch movies on 10.10 - they are jumping all the time, even with Compiz disabled and when that is the only thing I am doing. I have tried the solution to How to get NVidia GeForce GT 210 drivers working on Lucid Lynx? but it didn't work. How can I fix this? Here are the steps I took: apt-get --purge remove xserver-xorg-video-nouveau edit /etc/default/grub to add the line GRUB_CMDLINE_LINUX="nouveau.modeset=0" sudo update-grub Reboot Download official Linux drivers from nVidia site. sh filename-of-downloaded-driver-package

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• Alt/Shift key not released after switching keyboard layout

  - by szx

  Sometimes when I switch layout using either Alt+Shift or Ctrl+Shift the Alt key is not recognized as being released thus if I press e.g. F a File menu opens up. Last time that happend I lost all data I filled into a text form on a webpage because I pressed the Home key while typing and Firefox suddenly went to my home page! Moreoever, it still remains unreleased after hundreds of keypresses like if I'm holding it! Same goes for the Shift key. I would rather file a bug at Launchpad if I could but I have no clue what fucking package name should I type in the ubuntu-bug command! Have anyone else had this issue? Can you suggest a solution or maybe another place to report this bug?

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