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Articles indexed in June 2012

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• Ubuntu 12.04 - Workspace switcher is shown after switching to another workspace

  - by David Kuridža

  I've just upgraded to Ubuntu 12.04 on HP Envy 14 and found a rather interesting bug. When I switch between workspaces using keyboard shortcuts, for example moving down to Workspace 3 from Workspace 1, workspace switcher is shown (as seen on below screenshot). It stays there until I hit escape key. After debugging, the problem only happens when I change shortcut keys to Super + direction. With default Ctrl + Alt + direction, everything is OK. I've searched but haven't found this problem reported before, I'm also not sure this is called workspace switcher :) Can you please let me know what to search for, are there any logs which might have some related information?

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• On-board HDMI Audio

  - by TrackStar

  I have tried searching for answers to this issue but have had no luck. My HDMI display is working but I have no audio from the HDMI .There is no option for HDMI under sound preferences hardware or output. Purging and re-installing pulse audio doesn't change anything. I am using the on-board HDMI port on my motherboard, I do not have a PCI graphics card installed. CPU: i7-3770 Mobo: Asus Sabertooth z77 Kernel: 2.6.39-3-bb03 running aplay -l returns ** List of PLAYBACK Hardware Devices ** card 0: Intel [HDA Intel], device 0: ALC892 Analog [ALC892 Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: Intel [HDA Intel], device 1: ALC892 Digital [ALC892 Digital] Subdevices: 1/1 Subdevice #0: subdevice #0 Seems as if the system doesn't even recognize the possibilty of HDMI audio output. Any ideas?

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• Wifi won't work without ethernet (Ubuntu 12.04)

  - by alok

  I have a strange problem. I am running Ubuntu 12.04 on a Dell Studio 1558 laptop. I'm usually unable to access Wifi (I have a BCM43224 wireless card with the STA proprietary driver installed.) So I have to unplug the ethernet cable from my Wifi router and stick it into my laptop's ethernet port to access the Internet. But when I stick the cable back into the Wifi router and try connecting to Wifi, Wifi inexplicably starts working. How can I get Wifi to work all the time without having to 'jumpstart' it with an ethernet connection?

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• What would I do to figure out why Suspend sometimes crashes?

  - by Isaac

  Something is causing suspend crash occasionally. When it does crash, the system freezes with a black screen and stays on, not suspending. This makes me have to hold the power button until the system shuts down. One setting difference I have from most people is, I don't use the option that lets you suspend when the laptop lid is closed. So opening and closing the laptop lid has no actions. I like to press suspend manually. Could this preference change be the cause? How can I start looking for what's causing the crash, since the crash doesn't display errors?

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• xvkbd broken with warnings

  - by Maxrunner

  Im using the latest version of ubunto and i cant run xvkbd properly, i get these errors: $ xvkbd Warning: Cannot convert string "--lucidatypewriter-bold-r--*-12---*---iso8859-1" to type FontStruct xvkbd: Mode_switch not available as a modifier xvkbd: although ISO_Level3_Shift is used instead, AltGr may not work correctly Warning: Cannot convert string "--lucida-bold-i--*-14---*---iso8859-1" to type FontStruct xvkbd: Mode_switch not available as a modifier xvkbd: although ISO_Level3_Shift is used instead, AltGr may not work correctly how can i solve this?, im trying to use this with xbindkeys.

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• MacBook Pro 8.2 wifi keeps disconnecting, Ubuntu 12.04

  - by Sean Isley

  I am using a MacBook Pro 8.2 with Ubuntu 12.04, and my wifi disconnects consistently. I followed the directions as detailed here here, however, and it works up to expected speeds, but after within an hours time, the wifi disconnects and the only way to solve the issue is to either reboot OR disable wireless and re-enable it. lsmod | grep cfg80211 outputs: cfg80211 178818 2 b43,mac80211 I suspect that I did not blacklist the correct driver and there are two drivers causing instability, however I have no idea if I actually did it correctly.

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• Massive crash and kernel panic after updates yesterday, what now?

  - by Ghost

  Got 12.04 on an AMD+radeon machine, everything was running fine until last night when the update manager installed new packages, and now the moment I open a browser (firefox, chromium, anything) it crashes instantly. It says warning: at build/buildd/linux-3.5.0/arch/x86/kernel/smp.c:123 native_smp_send_reschedule+0x5b/0x60() Pid: 2432, comm: chrome_dbthread tainted: G D 3.5.0-2generic #2-ubuntu I already tried uninstalling the packages from the update log, didn't solve a thing. Depending of which browser I use I get a different reaction, like a complete freeze instead of a text console crash. Ideas? I really don't know what to do.

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• Installation after boot shows no display

  - by matthias

  I just booted 12.04 for installation from USB-stick. But there is a problem with the display. After boot I see a rectangle on the lower left corner of the screen, after a while I see "Ubuntu 12.04 ..." loading from USB-Stick, the Ubuntu-Desktop starts fine, clicking on Ubuntu-Install seems to work ... till identification, then Installation-window closed and ... nothing more happens. So I want to try Installation direct from the Menu at the beginning - before Ubuntu-12.04-loading. Butt I cannot see any menus at that time. I think there is an graphic-problem? How can I get the installation by menus, how would the Installation via Desktop going to work? Bye Matthias

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• Machine Check Exception

  - by Karl Entwistle

  When trying to install ubuntu-12.04-desktop-amd64.iso from USB I get one of the following errors http://en.wikipedia.org/wiki/Machine_Check_Exception states the error can occur due to -poorly fitted heatsink/computer fans (the same problem can happen with excessive dust in the CPU fan) -an overloaded internal or external power supply (fixable by upgrading) So I tried the following -Using rubbing alcohol to remove all the thermal paste from the CPU and heatsink, I then reseated the CPU after checking all the pins on the MOBO, everything seems fine. -Boot without the GPU to see if was the PSU that is being over stressed. -Removing all RAM apart from one stick and running a Memtest86 which it passed -Using Ubuntu 10.04.4 Desktop 64 bit (Different USB slots and USB sticks) -Using Ubuntu 12.04 Desktop 64 bit (Different USB slots and USB sticks) -Reset the BIOS using the Clear CMOS jumper -Removing all HD power cables and SATA cables -Updating the BIOS from F2 to F6 My PC is using the following parts. -Gigabyte GA-Z77-DS3H (F6 BIOS) -Intel Core i7 3770K 3.5GHz Socket 1155 -G-Skill 8GB (2x4GB) DDR3 1600Mhz RipjawsX Memory Kit CL9 (9-9-9-24) 1.5V -Be Quiet Shadow Rock Pro -Be Quiet Pure Power 730W Modular PSU -Sapphire HD 6870 1GB GDDR5 DVI HDMI DisplayPort PCI-E Graphics Card Any ideas?

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• Proper fstab entry to mount a samba share in 12.04

  - by JPbuntu

  I am a little confused on the proper fstab entry for a samba share in Ubuntu 12.04 I can get the drive to mount manually by using: sudo mount -t cifs //192.168.2.2/raid_drive /mnt/homeserver -o username=jon,password=password So I tried putting this in fstab: //192.168.2.2/raid_drive /mnt/homeserver cifs username=jon,password=password,iocharset=utf8,mode=0777,dir_mode=07??77 0 0 Which gives me this error in syslog: kernel: [ 2217.925354] CIFS: Unknown mount option mode kernel: [ 2217.936345] CIFS VFS: default security mechanism requested. The default security mechanism will be upgraded from ntlm to ntlmv2 in kernel release 3.3 This guide says to use smbfs although I believe smbfs is deprecated? What is a common fstab configuration for a samba share in Ubuntu 12.04? EDIT: Using the accepted answer below I was initially getting this error message (from dmesg): [ 45.520883] CIFS VFS: Error connecting to socket. Aborting operation [ 45.520990] CIFS VFS: cifs_mount failed w/return code = -115 although it turns out this was due to network connectivity issues, and not related to improper fstab entry.

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• Ubuntu 12.04 desktop crash [closed]

  - by David Mannock

  12.04 is stable under a light load, but not under intensive use of Gaussian 09 vB1. Looks like a heating issue, but psensor says that all is well on 32-cores @56C. Similar results for 64 cores. Machine shuts down after 2-3h. Syslog shows shut down. Whoopsie crash reporter sends in report. After 259 updates on the weekend, I am left wondering what the heck is wrong with this release? My answer would be "EVERYTHING!". Can someone help me do some systematic checks on this OS and hardware.

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• Getting "System program problem detected" pops up regularly after upgrade from 11.10 to 12.04

  - by Mixhael

  This started to happen immediately after I had rebooted the first time after doing a system upgrade to 12.04 from 11.10. It first starts with a dialogue that says "System program problem detected". Then when I try to hit 'report problem' not much happens. I am led through a dialogue that always ends up the problem cannot be solved. I am running a MacBook1,1 I am aware this is not a lot of information, however I'm not sure which information I need to publish and how should I obtain it to debug this problem. Here's a screenshot!

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• How to resolve the "Failed to download repository" error?

  - by jojo

  I've tried to update but then I got this error Here's the error information in that box: W:GPG error: http://extras.ubuntu.com precise Release: The following signatures were invalid: BADSIG 16126D3A3E5C1192 Ubuntu Extras Archive Automatic Signing Key <[email protected]>, W:Failed to fetch http://ppa.launchpad.net/unity-team/hud/ubuntu/dists/precise/main/source/Sources 404 Not Found, W:Failed to fetch http://ppa.launchpad.net/unity-team/hud/ubuntu/dists/precise/main/binary-i386/Packages 404 Not Found, E:Some index files failed to download. They have been ignored, or old ones used instead. And my Internet connection is working fine. After trying $ sudo apt-get install ppa-purge Reading package lists... Done Building dependency tree Reading state information... Done ppa-purge is already the newest version. The following packages were automatically installed and are no longer required: language-pack-zh-hans language-pack-kde-en language-pack-kde-zh-hans language-pack-kde-en-base kde-l10n-engb kde-l10n-zhcn language-pack-zh-hans-base firefox-locale-zh-hans language-pack-kde-zh-hans-base Use 'apt-get autoremove' to remove them. 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. $ sudo ppa-purge ppa:unity-team/hud Updating packages lists W: GPG error: http://extras.ubuntu.com precise Release: The following signatures were invalid: BADSIG 16126D3A3E5C1192 Ubuntu Extras Archive Automatic Signing Key <[email protected]> W: Failed to fetch http://ppa.launchpad.net/unity-team/hud/ubuntu/dists/precise/main/source/Sources 404 Not Found W: Failed to fetch http://ppa.launchpad.net/unity-team/hud/ubuntu/dists/precise/main/binary-i386/Packages 404 Not Found E: Some index files failed to download. They have been ignored, or old ones used instead. Warning: apt-get update failed for some reason PPA to be removed: unity-team hud Warning: Could not find package list for PPA: unity-team hud I've tried $ sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 16126D3A3E5C1192 Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring /tmp/tmp.v6Ucus0B10 --trustdb-name /etc/apt/trustdb.gpg --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --recv-keys --keyserver keyserver.ubuntu.com 16126D3A3E5C1192 gpg: requesting key 3E5C1192 from hkp server keyserver.ubuntu.com gpg: key 3E5C1192: "Ubuntu Extras Archive Automatic Signing Key <[email protected]>" not changed gpg: Total number processed: 1 gpg: unchanged: 1 And then started the same procedure but of no use.

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• Which version of ubuntu is compatible with ACER Aspire 5732Z?

  - by Mehdi Bateni

  I have an ACER Aspire 5732Z Laptop, and 6 days ago I have installed Ubuntu 11.10 on my laptop, But I found black screen in login. I have tried a lot of ways to solve this problem, but there is no way. So can you tell me which version is compatible with this ACER Aspire (5732Z)? Detail: Intel-Pentium-processor T4400 (2.2 GHz, 800 MHz FSB), Intel-GMA 4500M, 15.6" HD LCD, 2GB Memory, 320 GB HDD, Acer Nplify(TM) 802.11b/g/n. Thank You. .. And finally, I found that Linux Mint is best for my ACER-ASPIRE5732Z. It is also compatible with Ubuntu codes, because as I know it is base on Ubuntu.

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• What's the recommend way to enable / disable services?

  - by NES

  I read about how to enable and disable services in Ubuntu and it seems that there are different possibilities manage theme? The first method i found is update-rc.d to add new services to startup, which aims on the /etc/init.d folder and it's contents. The other one i found is the way to edit .conf the files in /etc/init folder. What's the recommended way to enable / disable / add services and why? Could you please give a short bulletproof step by step example how to add a service xyz in Ubuntu and enable and disable it?

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• Managing 404 error pages with noindex and url rewrite

  - by ZenMaster

  Currently I use custom 404 error pages, having the following meta on them : <meta content="noindex" name="robots"> My guess is this way Google will remove deleted pages faster from the index, anyone has experienced a case where it does ? Also, is it better to have the url path rewritten to the actual error page, like the url pattern: http://{mysite}/{404_error_page} or is it best to keep the old deleted page's url when serving a 404 error ?

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• .XML Sitemaps and HTML Sitemaps Clarification

  - by MSchumacher

  I've got a website with about 170 pages and I want to create an effective Sitemap for it as it is long due. The website is internally linked very well but I still want to take advantage of creating a sitemap to allow SE's to crawl my site easier and to hopefully increase my websites PR. Though I am slightly confused to what I must do: Is it necessary to create a .xml sitemap AND a HTML Sitemap (both)? ... Because I've never worked with .xml ... where do I put this file once it's created? In the Root folder? So I assume that this sitemap.xml is ONLY to be read by spiders and NOT by website visitors. IE: No visitor on my website is going to visit the page sitemap.xml, am I correct? ... Hence why I should also create an HTML sitemap (sitemap.htm)?

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• What is wrong with my Dot Product? [Javascript]

  - by Clay Ellis Murray

  I am trying to make a pong game but I wanted to use dot products to do the collisions with the paddles, however whenever I make a dot product objects it never changes much from .9 this is my code to make vectors vector = { make:function(object){ return [object.x + object.width/2,object.y + object.height/2] }, normalize:function(v){ var length = Math.sqrt(v[0] * v[0] + v[1] * v[1]) v[0] = v[0]/length v[1] = v[1]/length return v }, dot:function(v1,v2){ return v1[0] * v2[0] + v1[1] * v2[1] } } and this is where I am calculating the dot in my code vector1 = vector.normalize(vector.make(ball)) vector2 = vector.normalize(vector.make(object)) dot = vector.dot(vector1,vector2) Here is a JsFiddle of my code currently the paddles don't move. Any help would be greatly appreciated

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• Enabling and Disabling Colliders Unity

  - by Blue

  I'm trying to make the collider appear every 1 second. But I can't get the code write. I tried enabling the collider under a boolean and putting a yield to make it every second or so. But it's not working(gives me an error: Update() can not be a coroutine.). How would I fix this? Would I need a timer system and set the collider to be enabled every 'x' seconds and disabled every 'y' seconds? var waitTime : float = 1; var trigger : boolean = false; function Update () { if(!trigger){ collider.enabled = false; yield WaitForSeconds(waitTime); } if(trigger){ collider.enabled = true; yield WaitForSeconds(waitTime); } } }

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• Java - Finding distance between player and tile in array

  - by Corey

  What is the best way performance wise to do this? When I click a tile I want it to get the distance and if I am close enough I can interact with the tile. One way would be to find the tile by doing mouse / tile width when I click correct? But then how would I get that tiles position? I know how to find the distance I just don't know how to get a certain tiles position from the array when I click it

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• Can I publish my game code under GPL? How? What about an engine?

  - by Bane

  I made a game, and I am currently making a game engine. I want them both to be completely free and open source. What license should I choose? I was reading a bit on GPL, but that seems to be more suited for system code and libraries, AFAIK, as it doesn't permit the use of code for proprietorial software - which, in turn, implies that the code can be used in the first place. I can see that, obviously, game engines can be considered libraries, and therefor be used, but what about game code? Is there an alternative to GPL?

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• Looking for a small, light scene graph style abstraction lib for shader based OpenGL

  - by Pris

  I'm looking for a 'lean and mean' c/c++ scene graph library for OpenGL that doesn't use any deprecated functionality. It should be cross platform (strictly speaking I just dev on Linux so no love lost if it doesn't work on Windows), and it should be possible to deploy to mobile targets (ie OpenGLES2, and no crazy mandatory dependencies that wouldn't port well to modern mobile frameworks like iOS, Android, etc), with a license that's compatible with closed source software (LGPL or more liberal). Specific nice-to-haves would be: Cameras and Viewers (trackball, fly-by, etc) Object transform hierarchies (if B is a child of A, and you move A, B has the same transform applied to it) Simple animation Scene optimization (frustum culling, use VBOs, minimize state changes, etc) Text I've played around with OpenSceneGraph a lot and it's pretty amazing for fixed function pipeline stuff, but I've had a few of problems using it with the programmable pipeline and after going through their mailing list, it seems several people have had similar issues (going back years). Kitware's VES looks neat (http://www.vtk.org/Wiki/VES), but VES + VTK is pretty heavy. VTK is also typically for analyzing scientific data and I've read that it's not that appropriate for a general use case (not that great at rendering a lot of objects on scene,etc) I'm currently looking at VisualizationLibrary (http://www.visualizationlibrary.org/documentation/pag_gallery.html) which looks like it offers some of the functionality I'd like, but it doesn't explicitly support mobile targets. Other solutions like Ogre, Horde3D, Irrlicht, etc tend to be full on game engines and that's not really what I'm looking for. I'd like some suggestions for other libraries that I may have missed... please note I'm not willing to roll my own solution from scratch.

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• Drawing Grid in 3D view - Mathematically calculate points and draw line between them (Not working)

  - by Deukalion

  I'm trying to draw a simple grid from a starting point and expand it to a size. Doing this mathematically and drawing the lines between each point, but since the "DrawPrimitives(LineList)" doesn't work the way it should work, And this method can't even draw lines between four points to create a simple Rectangle, so how does this method work exactly? Some sort of coordinate system: [ ][ ][ ][ ][ ][ ][ ] [ ][2.2][ ][0.2][ ][2.2][ ] [ ][2.1][1.1][ ][1.1][2.1][ ] [ ][2.0][ ][0.0][ ][2.0][ ] [ ][2.1][1.1][ ][1.1][2.1][ ] [ ][2.2][ ][0.2][ ][2.2][ ] [ ][ ][ ][ ][ ][ ][ ] I've checked with my method and it's working as it should. It calculates all the points to form a grid. This way I should be able to create Points where to draw line right? This way, if I supply the method with Size = 2 it starts at 0,0 and works it through all the corners (2,2) on each side. So, I have the positions of each point. How do I draw lines between these? VerticeCount = must be number of Points in this case, right? So, tell me, if I can't supply this method with Point A, Point B, Point C, Point D to draw a four vertice rectangle (Point A - B - C - D) - how do I do it? How do I even begin to understand it? As far as I'm concered, that's a "Line list" or a list of points where to draw lines. Can anyone explain what I'm missing? I wish to do this mathematically so I can create a a custom grid that can be altered.

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• Syncing properties across a game server

  - by Vaughan Hilts

  I'm beginning to implement a simple scripting system into my networked server, and I've hit a snag. Before, I've been wrapping my calls into functions on objects that manipulate objects, but lately I've been finding this to be a pain for simple things. For example, if I set 'player.HP = 1'.. this works server-side. But the player side never sees this change unless I explicitly send a packet to inform the client. For many things like map swapping that require more complicated changes, like change X, Y, Map and do this.. I have a function. That's fine. But what about these small properties I want to sync?

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• Server for online browser game

  - by Tim Rogers

  I am going to be making an online single player browser game. The online element is needed so that a player can login and store the state of their game. This will include things like what buildings have been made and where they have been positioned as well as the users personal statistics and achievements. At this point in time, I am expecting all of the game logic to be performed client side So far, I am thinking I will use flash for creating the client side of the game. I am also creating a MySQL database to store all the users information. My question is how do I connect the two. Presumably I will need some sort of server application which will listen for incoming requests from any clients, perform the SQL query and then return the data. Does anyone have any recommendations of what technology/language to use?

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