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Articles indexed Thursday November 15 2012

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• an error in .profile ubuntu file prevents the system from booting?

  - by nafaa

  I tryied to set the JAVA_HOME environmet variable in the ~/.profile file and I made a mistake JAVA_HOME="/usr/lib/jvm/jdk1.6.0_37" PATH=$JAVA_HOME:PATH the error is in the PATH referencing. I put PATH rather than $PATH. this prevents me from login. I tried to edit the file using the recovery mode but it says that the file system is read only. so any suggestions how to deal with this issue. thanks

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• Strange GTK3 issue with Audacious and Evince (Document Viewer)

  - by Sman789

  I find that, in some GTK3 apps such as Audacious and Evince (Document Viewer), parts of the UI are pure black, which looks ugly and out-of-place. It is not intentional, as the screenshots on both websites show the app looking different. I only have this issue with the Adwaita GTK theme, but since it comes with Gnome 3 and is the main theme these apps are designed for, I'm guessing the problem is not simply the theme having some bug (though the Ubuntu package might). I have had this issue on two laptops now, running both Ubuntu 12.04 and Xubunu 12.10 with Gnome Shell and Adwaita. The screenshots below show the problem: Audcious's is visible in the search area around the text box, and behind the playlist tabs, and Evince's is visible in more or less the same position and around the document itself. Compare this from the Audacious homepage: With this image from my system: And Evince too:

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• How do I run Firefox OS as a standalone application?

  - by JamesTheAwesomeDude

  I got the add-on for the Firefox OS simulator, and it works great! It even keeps functioning after Firefox is closed, so I can save processing power for other things. I'd like to run it as a standalone application, so that I don't even have to open Firefox in the first place. I've gone to the System Monitor, and it says that the process (I guessed which by CPU usage and filename) was started via /home/james/.mozilla/firefox-trunk/vkuuxfit.default/extensions/[email protected]/resources/r2d2b2g/data/linux64/b2g/plugin-container 3386 true tab, so I tried running that in the Terminal (after I'd closed the simulator, of course,) but it gives this: james@james-OptiPlex-GX620:~/.mozilla/firefox-trunk/vkuuxfit.default/extensions/[email protected]/resources/r2d2b2g/data/linux64/b2g$ ./plugin-container 3386 true tab ./plugin-container: error while loading shared libraries: libxpcom.so: cannot open shared object file: No such file or directory james@james-OptiPlex-GX620:~/.mozilla/firefox-trunk/vkuuxfit.default/extensions/[email protected]/resources/r2d2b2g/data/linux64/b2g$ What should I do? Is what I'm attempting even possible? (It should be, since the simulator kept running even after Firefox itself was closed...) NOTE: I've tried chmod u+sx plugin-container, but that didn't help.

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• dist-upgrade broke my insatll HELP

  - by diefuchsjagden

  so I ran apt-get update; apt-get dist-upgrade the upgrade failed and I lost the gui, I have an encrypted /home drive. When I run apt-get * (any command) I have all kinds of errors mostly missing depends and thats because apparently my network stack is gone. I have no NIC if I run ifconfig. It doesn't even show up with lspci If I were to do a "clean" install of 10.04 LTS which is what I had on my on my build, will I lose all my data? BTW I was just using Ubuntu's default encryption to manage the encryption using my PSWD as the key so if I were to use the same user name and PSWD would my data be accessible? I can see my data from command line, when or if Xorg does start it just loads a basic window with nothing but a black X in the middle of the screen which I can only assume is my mouse cursor but it doesn't move! Reddit /r/linux had some ideas none of which worked was, no help. And apparently /r/ubuntu is full of jerks because all they did was ridicule me. If I can get my install back I probably will be switching back to either Slackware or Gentoo. The Ubuntu forums were of no help they had the same suggestion as /r/linux. I am about to just run my back up script to my back up drives and nuke everything else but I'd rather not.

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• Problem with Arcam rpac and Ubuntu 12.04

  - by user108393

  I have recently (?mistakenly) purchased an Arcam rpac USB DAC for my Ubuntu (12.04) PC. I have torn out all but 3 of my hairs trying to get this to work and have had absolutely no luck so far. I can see the Arcam USB audio device when i run aplay -l, however I cannot see it listed under the Sound settings. I can see the soundcard device when running alsamixer also, but if I try and select it, alsamixer crashes, stating "cannot load mixer controls: Invalid argument". Any ideas how to get this working (if it's even possible)? Does anyone else out there have the rpac with ubuntu? Thank you! Aman

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• Can I just download the Ubuntu ISO file to my USB and run it straight away with no installers?

  - by Paul Clarke

  I don't have access to running any installer at the minute so I knew that if running from the CD you just burn the iso file to the CD and your ready to go..but can I download this iso file to my USB and run it straight away when I change my bios to boot from USB?..or do I have to use the installer?..I can't use the installer for different reasons and I'm not really looking to install ubuntu just yet I just want to run it off my USB to try it out..so is it possible not to use the installer to put it on my USB? (I downloaded Ubuntu 12.10)

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• Good Atom Based Tablets that run Ubuntu?

  - by Anthony Papillion

  I'm starting a software project for a company that will deploy on tablet computers. They want to stick with Intel processors so they are looking for a good tablet that runs on an Atom processor. MY requirement is that it needs to also be able to run Ubuntu. It doesn't have to come with Ubuntu, I just need to be able to install it with no hassle. But, if it comes with Ubuntu preinstalled, that's even better. Can anyone make a recommend? Thanks! Anthony

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• Scroll with Middle Click

  - by Anast

  Can i use the middle click mouse button so i can scroll down faster like windows? I mean when i am in windows and i press the middle click somewhere i can scroll in a 4 way pointer shows on the screen and when i move the mouse in any direction the window will scroll in that direction even without pressing the middle click. Is there anything like this in ubuntu? How can i do this esspecially in chrome!

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• My laptop shuts down when I remove the charger

  - by Hakim0

  Laptop shuts down when charger is removed. As well I get a message when booting up saying disk drive for /media/3936-3939 is not ready or not present. About a week ago I was trying to install a matlab iso file using mount commands etc... I tried mount, fuseiso, and UNETbootin. I have a feeling this may have something to do with message I'm getting from booting up. If anyone can point me in the right direction or help me out. Many thanks.

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• Configuration of LDAP client on 12.04

  - by user106515

  We have here a way to log in the computers base on Ldap(openldap). You can use any seat with the login/pass you have. Well my problem is that everything worked fine till I had to upgrade Ubuntu to the last version (12.04). Now, it is far from impossible to log in because you only can choose administrator account! That would be my issue; I want to Lightdm allow me to choose the user e.g : pagonzalez or rmlago or whatever the login-name you have. I´ve been searching for 2 days now, and nothing comes up! Hope somebody here has any idea about it!

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• Installing package + dependancies and removing them all

  - by Sman789

  I currently use Xubuntu and was considering installing/trying GNOME Shell or Cinnamon by installing their respective metapackage. However, doing so would result in a massive number of dependencies being installed which would be almost impossible to remove individually at a later date if I decided I didn't like it. I wonder, therefore, if there is a way that I can track which packages Synaptic automatically downloads as part of the process and create a script of some sort to remove them all as well. I could then rest assured that if I don't like any of my new desktop environments, I can remove them in full without leaving a load of other applications and libraries lying around. Thankyou for any help! :)

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• Why do I get a blank screen when starting Wubi?

  - by August Guillaume

  I used Wubi to download 12.04 on a new partition. When restarting, the computer (Levono windows 7 -64) froze with no signal on my screen. Turning the computer on and off I received the option to sign in on windows or ubuntu. Windows worked well, but Ubuntu seems to bomb again as before. I can look at the new partition where some Ubuntu files exist via Windows explorer. What am I to do? Is 12.04 compatible with windows 7?

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• How to open a MIB file in tkmib?

  - by l0b0

  I've tried to open several MIB files in tkmib without success. For example: $ sudo apt-get install tkmib $ wget http://www.mibsearch.com/vendors/Compaq/download/CPQHLTH-MIB $ tkmib CPQHLTH-MIB Click "walk", then you should get an error message like this: setting opts getaddrinfo: CPQHLTH-MIB No address associated with hostname error:snmp_new_session: Couldn't open SNMP session at /usr/lib/perl5/SNMP.pm line 475. unable to create session at /usr/lib/perl5/SNMP.pm line 547. Tk::Error: Can't call method "getnext" on unblessed reference at /usr/bin/tkmib line 506. main::snmpwalk at /usr/bin/tkmib line 506 Tk callback for .frame5.button2 Tk::__ANON__ at /usr/lib/perl5/Tk.pm line 250 Tk::Button::butUp at /usr/lib/perl5/Tk/Button.pm line 175 <ButtonRelease-1> (command bound to event) As I'm completely new to SNMP and MIB files, and man tkmib is sparse to say the least, what do I actually need to do to be able to work with this file?

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• Algorithm for procedural city generation?

  - by Zove Games

  I am planning on making a (simple) procedural city generator using Java. I need ideas on whan algorithm to use for the layout, and the actual buildings. The city will mostly have skyscrapers, not really much complex stuff. For the layout I already have a simple algorithm implemented: Create a Map with java.awt.Point keys and Integer values. Fill it with all the points in the city's bounds with the value as -1 (unnassigned) Shuffle the map, and assign the 1st 10 of the keys IDs (from 1-10) Loop until all points have IDs: Loop though all points: Assign points next to an assigned point IDs of the point next to them, if 2 or more points border the point, then randomly choose which ID the point will get. You will end up with 10 random regions. Make roads bordering these regions. Fill the inside of each region with a randomly spaced and randomly rotated grid PROBLEM: This is not the fastest way to do it. What algorithm should I use for the layout. And what should I use to make each building's design? I don't even know how I'm going to do that yet (fractals maybe). I just need some ideas, not actual code.

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• Why is permadeath essential to a roguelike design?

  - by Gregory Weir

  Roguelikes and roguelike-likes (Spelunky, The Binding of Isaac) tend to share a number of game design elements: Procedurally generated worlds Character growth by way of new abilities and powers Permanent death I can understand why starting with permadeath as a premise would lead you to the other ideas: if you're going to be starting over a lot, you'll want variety in your experiences. But why do the first two elements imply a permadeath approach?

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• TileMapRenderer in libGDX not drawing anything

  - by Benjamin Dengler

  So I followed the tutorial on the libGDX wiki to draw Tiled maps but it doesn't seem to render anything. Here's how I setup my OrthographicCamera and load the map: camera = new OrthographicCamera(Gdx.graphics.getWidth(), Gdx.graphics.getHeight()); map = TiledLoader.createMap(Gdx.files.internal("maps/test.tmx")); atlas = new TileAtlas(map, Gdx.files.internal("maps")); tileMapRenderer = new TileMapRenderer(map, atlas, 8, 8); And here is my render function: Gdx.gl.glClearColor(0, 0, 0, 1); Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT); camera.update(); tileMapRenderer.render(camera); Also I did pack the tile map using the TiledMapPacker. I'm completely stumped... am I missing anything obvious here? EDIT: While debugging I noticed that the TileAtlas seems to be empty, which I guess shouldn't be the case, but I have no idea why it's empty.

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• Need help transforming DirectX 9 skybox hlsl shader to DirectX 11

  - by J2V

  I am in the middle of implementing a skybox to my game. I have been following this tutorial http://rbwhitaker.wikidot.com/skyboxes-2. I am using MonoGame as a framework and in order to support both Windows and Windows 8 metro I need to compile the shader with pixel and vertex shader 4. compile vs_4_0_level_9_1 compile ps_4_0_level_9_1 However some of the hlsl syntax has been updated with DX10 and DX11. I need to update this hlsl code: float4x4 World; float4x4 View; float4x4 Projection; float3 CameraPosition; Texture SkyBoxTexture; samplerCUBE SkyBoxSampler = sampler_state { texture = <SkyBoxTexture>; magfilter = LINEAR; minfilter = LINEAR; mipfilter = LINEAR; AddressU = Mirror; AddressV = Mirror; }; struct VertexShaderInput { float4 Position : POSITION0; }; struct VertexShaderOutput { float4 Position : POSITION0; float3 TextureCoordinate : TEXCOORD0; }; VertexShaderOutput VertexShaderFunction(VertexShaderInput input) { VertexShaderOutput output; float4 worldPosition = mul(input.Position, World); float4 viewPosition = mul(worldPosition, View); output.Position = mul(viewPosition, Projection); float4 VertexPosition = mul(input.Position, World); output.TextureCoordinate = VertexPosition - CameraPosition; return output; } float4 PixelShaderFunction(VertexShaderOutput input) : COLOR0 { return texCUBE(SkyBoxSampler, normalize(input.TextureCoordinate)); } technique Skybox { pass Pass1 { VertexShader = compile vs_2_0 VertexShaderFunction(); PixelShader = compile ps_2_0 PixelShaderFunction(); } } I quess I need to change Texture into TextureCube, change sampler, swap texCUBE() with TextureCube.Sample() and change PixelShader return semantic to SV_Target0. I'm very new in shader languages and any help is appreciated!

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• XNA 4.0 - container with content, that can slide (C#)

  - by DijkeMark

  I got an idea, but I got no idea on how to make it. Okay, so here is the deal. I want a container which can contain certain objects (These objects will draw the sprites/graphics). But because of different screen sizes, I want to be able to scale the containers width and height. But I do not want the objects in the container, that go outside of the container, because of the scaling to be visible. Because I want the objects all to be positioned horizontaly to eachother and I want a horizontal sliderbar, so I can slide from left to right within the container. I wonder if anyone could point me in the right direction. Thanks in Advance, Mark

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• Minecraft mob spawning coding?

  - by Richard

  I recently discovered how to change the game (with MCP) and now I'd like to do my first "big" change to the game, creating new mobs. I already made their skin, the model, the AI and added a new entityID to the mob list. I just need to know how to make them spawn normally under similar conditions to zombies and skeletons. Thanks in advance! :D EDIT: Also, if anyone knows it, post tutorials about minecraft code editing, that would be great.

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