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• iwconfig, iw not displaying wireless information

  - by Srivatsa Kanchi

  after fresh install to 12.10, the wireless information is not shown by both iwconfig and iw. The wireless sets up successfully and able to connect This is what i get $ iwconfig wlan0 wlan0 IEEE 802.11abgn ESSID:off/any Mode:Managed Access Point: Not-Associated Tx-Power=14 dBm Retry long limit:7 RTS thr:off Fragment thr:off Power Management:off $ iw wlan0 link Not connected. $ uname -a Linux srivatsa-ThinkPad-T61 3.5.0-18-generic #29-Ubuntu SMP Fri Oct 19 10:26:51 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

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• Music for Kids Game!

  - by Dane

  I'm developing a Multimedia Software for Kindergarten Kids. It introduce them to animals, Alphabets, Simple Math, Colors and it contain some simple games. Music is very crucial for my project and it is very important to choose the right sort of music for different sections. But unfortunately I know nothing about music. Is there a music consultant firm which can help me to choose melodies and rythmes for my project from free music available in internet. My Budget is limited but as this is mandatory and I have no knowledge or taste about music, I think I can afford to pay for this.

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• xubuntu 12.04 slow boot

  - by user76390

  my xubuntu 12.04 fresh installed boots in more than 30 seconds, here the first big gap in dmesg: [ 1.984795] firewire_core: created device fw0: GUID 000ae4060034203a, S400 [ 2.336568] EXT4-fs (sda1): mounted filesystem with ordered data mode. Opts: (null) [ 15.465275] ADDRCONF(NETDEV_UP): eth0: link is not ready [ 15.503348] udevd[331]: starting version 175 once booted everything works fine (networks included) thanks for help!

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• Linux / UNIX: Encrypt Backup Tape Using Tar &amp; OpenSSL

  <b>Cyberciti:</b> "How do I make sure only authorized person access my backups stored on the tape drives (DAT, DLT, LTO-4 etc) under Linux or UNIX operating systems? How do I backup /array22/vol4/home/ to /dev/rmt/5mn or /dev/st0 in encrypted mode?"

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• typeset: not found error when executing shell script. Am I missing a package or something?

  - by user11045

  Hi, below is the error and corresponding script lines: spec@Lucifer:~/Documents/seagull.svn.LINUX$ ./build.ksh ./build.ksh: 36: typeset: not found ./build.ksh: 39: typeset: not found ./build.ksh: 44: function: not found Command line syntax of - options -exec : mode used for compilation (default RELEASE) -target : target used for compilation (default all) -help : display the command line syntax ./build.ksh: 52: function: not found ERROR: spec@Lucifer:~/Documents/seagull.svn.LINUX$ Script Init of variables BUILD_TARGET=${BUILD_DEFAULT_TARGET} BUILD_EXEC=${BUILD_DEFAULT_EXEC} typeset -u BUILD_OS=uname -s | tr '-' '_' | tr '.' '_' | tr '/' '_' BUILD_CODE_DIRECTORY=code BUILD_DIRECTORY=pwd typeset -u BUILD_ARCH=uname -m | tr '-' '_' | tr '.' '_' | tr '/' '_' BUILD_VERSION_FILE=build.conf BUILD_DIST_MODE=0 BUILD_FORCE_MODE=0

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• When to use mixins in Ruby

  - by Gilles

  I am wondering when to use mixins? I have read about them. Many authors compare them to interfaces, abstract classes, etc. Mixins are modules that are mixed-in and modules are a way to group similar methods, constants and classes together. I have seen examples where a module for math functions is created. It makes sense to group and reuse such functions but should I only mix these in a class if I am faced with an inheritance situation? Should I mix these in anytime I want to use them in a class? Should they be used exactly like interfaces in other languages or are there other subtleties?

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• Mount: "The disk drive for UUID=<uuid for /> is not ready yet or not present."

  - by searchfgold6789

  I recently did the update from 12.04 to 12.10 on my old Dell Latitude CPx laptop (Pentium III). When I rebooted I got this error message with no response from keyboard input. Below it is says Wait to continue, press S to skip mounting, or M for manual recovery. I also see occasional errors pop up on the screen from mountall and Plymouth. I can still get into Recovery Mode. Can anyone shed some light on the matter?

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• How do I disable network connection at prelogin?

  - by ProGNOMmers

  --- This question is related to Ubuntu 12.10, since previous versions did not connect to network before login --- I had a bad boot today: the Ubuntu screen was blocked at startup time, after a green [OK] and a white blinking underscore. In recovery mode I figured out the problem: NetworkManager hung trying to connect to a wireless network that wasn't available anymore, and so I couldn't reach the prelogin level. Anyway: I really don't like that the pc connects to a network before the user logging in. How is it possible to disable it?

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• Nvidia GT218 repository drivers don't work

  - by user1042840

  I upgraded all packages with sudo apt-get upgrade command on my Ubuntu 10.04 box and I have Ubuntu 12.04 3.2.0-29-generic-pae now. I have two monitors and the following GPU: 01:00.0 VGA compatible controller: NVIDIA Corporation GT218 [NVS 300] (rev a2) After upgrading to 12.04, I somehow lost my previous setup with one common workspace stretched across two monitors. When Ubuntu starts only one monitor is on. I can see the message on the active monitor: Not optimum mode. Recommended mode: 1680x1050 60Hz I used Nvidia proprietary drivers on 10.04 but now jockey-text --list shows: xorg:nvidia_current - NVIDIA accelerated graphics driver (Proprietary, Disabled, Not in use) xorg:nvidia_current_updates - NVIDIA accelerated graphics driver (post-release updates) (Proprietary, Enabled, Not in use) When I run sudo nvidia-settings it says You do not appear to be using the NVIDIA X driver. Please edit your X configuration file (just run `nvidia-xconfig` as root), and restart the X server.' I typed nvidia-xconfig and rebooted, but jockey-text --list says the same after the reboot: Not in use. The same with nvidia-current - Enabled but Not in use. I also tried nvidia-173 but I ended up in tty immediately at startup so I removed it. I used to have some problems with Nvidia proprietary drivers on 10.04, I had to put paths to EDID files in /etc/X11/xorg.conf explicitly, but the resolution was as recommended and both monitors were working. If I understand correctly, nouveau drivers are used now by default because the resolution is still quite high, definitely not 800x600, xrandr showed: xrandr: Failed to get size of gamma for output default Screen 0: minimum 320 x 400, current 1600 x 1200, maximum 1600 x 1200 default connected 1600x1200+0+0 0mm x 0mm 1600x1200 66.0* 1280x1024 76.0 1024x768 76.0 800x600 73.0 640x480 73.0 640x400 0.0 320x400 0.0 1680x1050_60.00 (0x4f) 146.2MHz h: width 1680 start 1784 end 1960 total 2240 skew 0 clock 65.3KHz v: height 1050 start 1053 end 1059 total 1089 clock 60.0Hz However, colors seem a bit faded and blurry with nouveau drivers. Mouse cursor is invisible if it's placed inside Firefox window, and only one monitor is working. I like open source and if it's possible I'd prefer to use nouveau drivers but a few things should be fixed. I'm curious why nvidia-current drivers from the repository don't work now. I read it has something to do with the new X11 server in Ubuntu 12.04, is it true? How can I get it back to work?

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• Read-only filesystem

  - by János Harsányi

  I've resized a partition (ext4) from a Live CD with GParted, and after reboot it says that the file system is read-only. I've rebooted again from the CD and checked it with GParted with no errors. How could I find out why does it re-mount the file system in read-only mode? edit: It starts normally, but after some time, the "/" mount point gets remounted with read only settings, so I think it does have errors eventually. Is there any other way to repair it?

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• openGL managing images, VBOs and shaders

  - by roxlu

  I'm working on a game where I use shaders with vertex attributes (so not immediate mode). I'm drawing lots of images and changing the width/height of the quads I use to draw them a lot. To optimize this it's probably a good idea to have one buffer but then one needs to update the complete buffer when one image changes (or only a part of the buffer using glBufferSubData...) I was just wondering what kind of strategies you guys are using?

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• Mixed java version installed

  - by david99world

  I've got the following in /.bashrc export JAVA_HOME=/usr/bin/jdk1.7.0_03/ export PATH=$PATH:/usr/bin/jdk1.7.0_03/bin This is fine, if I do $JAVA_HOME I get the directory above. The problem is if I do java -version I get... OpenJDK Runtime Environment (IcedTea6 1.11.1) (6b24-1.11.1-4ubuntu3) OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode) How do I make the official jdk version the right one? Sorry I'm extremely new to Ubuntu. Thanks, David

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• How can I generate signed distance fields (2D) in real time, fast?

  - by heishe

  In a previous question, it was suggested that signed distance fields can be precomputed, loaded at runtime and then used from there. For reasons I will explain at the end of this question (for people interested), I need to create the distance fields in real time. There are some papers out there for different methods which are supposed to be viable in real-time environments, such as methods for Chamfer distance transforms and Voronoi diagram-approximation based transforms (as suggested in this presentation by the Pixeljunk Shooter dev guy), but I (and thus can be assumed a lot of other people) have a very hard time actually putting them to use, since they're usually long, largely bloated with math and not very algorithmic in their explanation. What algorithm would you suggest for creating the distance fields in real-time (favourably on the GPU) especially considering the resulting quality of the distance fields? Since I'm looking for an actual explanation/tutorial as opposed to a link to just another paper or slide, this question will receive a bounty once it's eligible for one :-). Here's why I need to do it in real time: There's something else:

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• OpenGL ES, orthopgraphics projection and viewport

  - by DarkDeny

  I want to make some simple 2D game on iOS to familiarize myself with OpenGL ES. I started with Ray Wenderlich tutorial (How To Create A Simple 2D iPhone Game with OpenGL ES 2.0 and GLKit). That tutorial is quite good, but I miss some parts of a puzzle. Ray creates orthographic projection using some magic numbers like 480 and 320. It is not clear to me why did he take these numbers, and as far as I can see - sprite is not mapped to the ipad simulator screen one-to-one pixel. I tried to play with parameters with which ortho matrix is created, but I cannot figure out what math is here. How can I calculate numbers (bottom, top, left, right, close, far) which will be parameters to orthographic projection matrix creation and have sprite on the screen shown in its original size?

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• R Statistical Analytics with Faster Performance for Enterprise Database Access and Big Data

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

  Further demonstrating commitment to the open source community, Oracle has just released enhanced support of the R statistical programming language for Oracle Solaris and AIX in addition to Linux and Windows, connectivity to Oracle TimesTen In-Memory Database in addition to Oracle Database, and integration of hardware-specific Math libraries for faster performance.  Oracle’s Open Source distribution of R is available with the Oracle Big Data Appliance and available for download now. Oracle also offers Oracle R Enterprise, a component of Oracle Advanced Analytics that enables R processing on Oracle Database servers.   This all goes to make big data analytics more accessible in the enterprise and improving data scientist productivity with faster performance Since its introduction in 1995, R has attracted more than two million users and is widely used today for developing statistical applications that analyze big data. Analyst Report: Oracle Advances its Advanced Analytics Strategy  

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• Previewing a Demo Level in Mobile for UDK?

  - by Reno Yeo

  I've already clicked on "Emulate Mobile Features" and everything has been compiled. I've also set the mobile previewer settings to iPhone 4's dimensions and features. However, when i click on the mobile previewer, a new window pops up but it goes into a "Not Responding" mode after a while. Is there anything I'm doing wrong? To be honest, I'm afraid of the difficulty curve required in learning UDK, but I am interested in developing a game for it.

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• Portal 2 in LEGO Stop Motion [Video]

  - by Jason Fitzpatrick

  If you’re a fan of the Portal video game series, this well-executed LEGO stop-motion film combines Portal characters, clever animation, jokes, and even a Black Mesa reference or two. LEGO Portal 2 [via Wired] How to Factory Reset Your Android Phone or Tablet When It Won’t Boot Our Geek Trivia App for Windows 8 is Now Available Everywhere How To Boot Your Android Phone or Tablet Into Safe Mode

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• Dual boot - 12.04 installed first

  - by graeme

  I have found many guides with how to install windows and ubuntu in dual boot mode, but none from the perspective of a Ubuntu user. Unfortunately Wine or OpenOffice do not display a document that I am working on properly so I am forced to getting windows back temporarily. Can anyone give me some guidance on how to go about this, sorry but step by step instructions are needed as I am still fairly new to Linux

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• How to better start learning programming - with imperative or declarative languages?

  - by user712092

  Someone is interested in learning to program. What language paradigm should I recomend him - imperative or declarative? And what programming language should he start with? I think that declarative because it is closer to math. And I would say that Prolog might be the best start because it is based on logic and programs are short. On the other hand at school we started learning from imperative languages and I am not sure whether there is a benefit to start with them instead of declarive ones. Thanks. :)

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• What are the factors that determine the default frequency of a shader call?

  - by user827992

  After i have been played for some days with various vertex and fragments shaders seems clear to me that this programs are called by the GPU at every and each rendering cycle, the problem is that I can't really quantify this frequency and I can't tell if is based on some default values or not because I don't have a big collection of hardware right now to do extensive tests. For what i know the answer could be really trivial like "it's the same of the refresh rate of your monitor", but i would like some good answers on that to be clear on this. For instance looks really odd to me that all the techniques used to control the amount of FPS that i have seen until now uses a call for the OpenGL function glutGet(GLUT_ELAPSED_TIME) to retrieve a value in ms about when the rendering started but I have to relies on the CPU to do the math. Why I can't set an FPS value in OpenGL if OpenGL clearly has a counter and a timer/clock? PS I'm referring to OpenGL 3.0+

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• OpenJDK default options to always use the server VM

  - by montrealmike

  I got a warning message: jvm uses the client vm, make sure to run java with the server vm for best performance by adding -server to the command line In fact, when i run java -version i get: OpenJDK Runtime Environment (IcedTea7 2.3.2) (7u7-2.3.2a-0ubuntu0.12.04.1) OpenJDK Client VM (build 23.2-b09, mixed mode, sharing) How does one go about and change OpenJDK's defaults to always start under the server VM?

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• Ralink Bluetooth not working in Ubuntu 13.04

  - by Sourabh

  My Bluetooth is not working in Ubuntu 13.04. I am unable to turn it on and also, Bluetooth icon doesn't show up in the top bar. I asked about this on #ubuntu IRC and they said that I am missing the proprietary drivers for it. There is nothing under Additional Drivers in Software and Updates Bluetooth does work 'Try Ubuntu mode' when I boot Ubuntu from DVD/USB. How can I get the required drivers?

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• How do I determine whether bumblebee is working as expected?

  - by Christian Fazzini

  I followed the instructions at https://wiki.ubuntu.com/Bumblebee sudo add-apt-repository ppa:bumblebee/stable sudo add-apt-repository ppa:ubuntu-x-swat/x-updates sudo apt-get update Instead of installing the proprietary nvidia drivers, via: sudo apt-get install bumblebee bumblebee-nvidia linux-headers-generic I did: sudo apt-get install --no-install-recommends bumblebee linux-headers-generic How do I determine that power savings mode is active and that my dedicated GPU isn't running? One thing that bugs me is that if I go to System Settings - Details - Graphics. Driver is shown as Unknown.

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• Combobox binding with different types

  - by George Evjen

  Binding to comboboxes in Silverlight has been an adventure the past couple of days. In our framework at ArchitectNow we use LookupGroups and LookupValues. In our database we would have a LookupGroup of NBA Teams for example. The group would be called NBATeams, we get the LookupGroupID and then get the values from the LookupValues table. So we would end up with a list of all 30+ teams. Our lookup values entity has a display text(string), value(string), IsActive and some other fields. With our applications we load all this information into the system when the user is logging in or right after they login. So in cache we have a list of groups and values that we can get at whenever we want to. We get this information in our framework simply by creating an observable collection of type LookupValue. To get a list of these values into our property all we have to do is. var NBATeams = AppContext.Current.LookupSerivce.GetLookupValues(“NBATeams”); Our combobox then is bound like this. (We use telerik components in most if not all our projects) <telerik:RadComboBox ItemsSource="{Binding NBATeams}”></telerik:RadComboBox> This should give you a list in your combobox. We also set up another property in our ViewModel that is a just single object of NBATeams  - “SelectedNBATeam” Our selectedItem in our combobox would look like, we would set this to a two way binding since we are sending data back. SelectedItem={Binding SelectedNBATeam, mode=TwoWay}” This is all pretty straight forward and we use this pattern throughout all our applications. What do you do though when you have a combobox in a ItemsControl or ListBox? Here we have a list of NBA Teams that are a string that are being brought back from the database. We cant have the selected item be our LookupValue because the data is a string and its being bound in an ItemsControl. In the example above we would just have the combobox in a form. Here though we have it in a ItemsControl, where there is no selected item from the initial ItemsSource. In order to get the selected item to be displayed in the combobox you have to convert the LookupValue to a string. Then instead of using SelectedItem in the combobox use SelectedValue. To convert the LookupValue we do this. Create an observable collection of strings public ObservableCollection<string> NBATeams { get; set;} Then convert your lookups to strings var NBATeams = new ObservableCollection<string>(AppContext.Current.LookupService.GetLookupValues(“NBATeams”).Select(x => x.DisplayText)); This will give us a list of strings and our selected value should be bound to the NBATeams property in our ItemsSource in our ItemsControl. SelectedValue={Binding NBATeam, mode=TwoWay}”

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• Odds For Fighting Game

  - by thinkfuture

  I'm creating a fighting game where two opponents face off against each other in the ring. While I've been able to figure out the odds of a player winning based on previous wins/losses, I have yet to find a formula which modifies those odds based on opponent. For example: Player 1: W:5 L:5 - 1/1 odds Player 2: W:5 L:0 - 1/5 odds I want to calculate the odds that Player 1 will wins against player 2. Compounding this the players could be of different levels: if the players are within a few levels of each other, the odds should map closely to wins/losses. However, as the levels diverge, the odds of the lower level player winning reduce. As a swag: Player 1 - W:5 L:5 - 1:1 odds Against a level 8 - 1:2 Against a level 9 - 2:3 Against a level 10 - 1:1 Against a level 11 - 3:2 Against a level 12 - 2:1 These are just estimates, my sense is that there is a math formula out there which will calculate that - can anyone out there point me to what this could be? Thanks...Chris

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