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• an example of schrödinbug?

  - by Pacerier

  This wiki page tells : A schrödinbug is a bug that manifests only after someone reading source code or using the program in an unusual way notices that it never should have worked in the first place, at which point the program promptly stops working for everybody until fixed. The Jargon File adds: "Though... this sounds impossible, it happens; some programs have harbored latent schrödinbugs for years." I've no idea what they are talking about. Can someone provide an example of how it is like (like with a fictional situation)?

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• File manager respawns with ubuntuone

  - by pygator

  Starting Feb 11, my Ubuntu 10.10 desktop respawns FileManager many times(hundreds). You can observe the "Starting File Manager" processes at the bottom of the gnome desktop. I can make this behaviour stop by: System - Preferences - Ubuntu One - Services - uncheck "Files". Can someone walk me though the debug process? Linux 2.6.35-25-generic #44-Ubuntu SMP Fri Jan 21 17:40:48 UTC 2011 i686 GNU/Linux I'm trying to reset the Ubuntu One configuration. I found good information here: https://wiki.ubuntu.com/UbuntuOne/Bugs Look for "ROOT_MISMATCH in syncdaemon.log" After running through the steps to reset and restart UbuntuOne, no more "Starting File Mangager" respawns.

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• A question about "add-apt-repository"(gcc 4.7 or bumblebee)

  - by girlkoo

  I install ubuntu 12.04 in my notebook and I use c++. I want to use c++11,so I want to upgrade my gcc to gcc4.7. I do like this: sudo add-apt-repository ppa:ubuntu-toolchain-r/test sudo apt-get update sudo apt-get install gcc-4.7 sudo apt-get install g++-4.7 but when I run "sudo apt-get install gcc-4.7", it just can find gcc-4.7-base not gcc-4.7, and when I run "sudo apt-get install g++-4.7", it can find nothing... Today, I want to install the "bumblebee" and do like this: sudo add-apt-repository ppa:bumblebee/stable sudo apt-get update sudo apt-get install bumblebee bumblebee-nvidia sudo reboot but when I run "sudo apt-get install bumblebee bumblebee-nvidia", it tells me the packages can't be find. The ways I methoded are specially use to ubuntu 12.04, the links is: Installing gcc 4.7 https://wiki.ubuntu.com/Bumblebee#Installation What can I do? Thank you!My email is [email protected]

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• Conways Game of Life C#

  - by Darren Young

  Hi, Not sure if this is the correct place for this question or SO - mods please move if necessary. I am going to have a go at creating GoL over the weekend as a little test project : http://en.wikipedia.org/wiki/Conway's_Game_of_Life I understand the algorithm, however I just wanted to check regarding the implementation, from maybe somebody that has tried it. Essentially, my first (basic) implementation, will be a static grid at a set speed. If I understand correctly, these are the steps I will need: Initial seed Create 2d array with initial set up Foreach iteration, create temporary array, calculating each cells new state based on the Game of Life algorithm Assign temp array to proper array. Redraw grid from proper array. My concerns are over speed. When I am populating the grid from the array, would it simply be a case of looping through the array, assigning on or off to each grid cell and then redraw the grid? Am I on the correct path?

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• Configuring the SOA Human Task Hostname by Antonis Antoniou

  - by JuergenKress

  When a human task is opened in BPM Workspace, it will try by default to connect to either localhost or the server's alias. So if you try to access the BPM Workspace remotely (from a computer other than where Oracle SOA is running) you will get an http error (unable to connect). You can fix this issue at run-time using the Enterprise Manager (EM). Login to EM and from the farm navigator select your composite by expanding the "SOA", "soa-infra" and your partition node. Read the complete article here. SOA & BPM Partner Community For regular information on Oracle SOA Suite become a member in the SOA & BPM Partner Community for registration please visit www.oracle.com/goto/emea/soa (OPN account required) If you need support with your account please contact the Oracle Partner Business Center. Blog Twitter LinkedIn Facebook Wiki Technorati Tags: Human task,Antonis Antoniou,SOA Community,Oracle SOA,Oracle BPM,Community,OPN,Jürgen Kress

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• How to register properly to the most famous SEOs? [closed]

  - by Olivier Pons

  I know it may have been asked many times, but here's my question: I'm about to open my website which I'm more than proud of (I'll talk about its capabilities on my blog). Anyway I want it to be registered by all the most famous SEOs and to be fetched often because it may grow up quickly. I know that a lot of people may have already asked this question but nevertheless I didn't find something relevant to that. I just want to know where I should register on all major SEOs when I release a website. Maybe this is a wiki, but I didn't find anything helpful on the subject. Any advice welcome.

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• stuck with 640x480 resolution using bumblebee on 10.04

  - by pholz

  I just installed bumblebee on a Dell XPS L502X. It basically works: optirun glxspheres does exactly what it should. However, X is running with a resolution of 640x480. I can try to change settings with optirun nvidia-settings -c :8 (as suggested on the bumblebee wiki), but in the relevant section it only lists resolutions up to 640x480. In the /etc/bumblebee/xorg.conf.* files, there are no Monitor or Screen sections. Adding them doesn't change anything. How can I change the resolution?

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• Awesome-WM inside gnome-shell -> Get rid of top bar

  - by joe8

  I am using awesome-wm now, and was trying to get it working with gnome-shell. I have basically followed those steps: http://awesome.naquadah.org/wiki/Quickly_Setting_up_Awesome_with_Gnome#Ubuntu_11.10 But now I have two bars, one at the bottom and one at the top. Is there any way to get rid of one of those (preferring top bar). If that is not possible, is there a way to load the gnome-shell widgets in the top bar? Now it's only displaying the time. screen: Thanks ;)

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• Kepler orbit : get position on the orbit over time

  - by Artefact2

  I'm developing a space-simulation related game, and I am having some trouble implementing the movement of binary stars, like this: The two stars orbit their centroid, and their trajectories are ellipses. I basically know how to determine the angular velocity at any position, but not the angular velocity over time. So, for a given angle, I can very easily compute the stars position (cf. http://en.wikipedia.org/wiki/Orbit_equation). I'd want to get the stars position over time. The parametric equations of the ellipse works but doesn't give the correct speed : { X(t) = a×cos(t) ; Y(t) = b×sin(t) }. Is it possible, and how can it be done?

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• Trouble launch byobu with custom windows.NAME file

  - by Brendan Piater

  Apologies if the solution is obvious but I'm stumped! I want to launch byobu from within my Gnome 3 desktop environment on 12.04 but it's not working for me as yet. Here's what I have: created a windows list file ~/.byobu/windows.mrb then tried to launch byobu from within the gnome terminal with: $ BYOBU_WINDOWS=mrb byobu But it gives me the default windows list, NOT my windows list. I followed these instructions from the wiki: http://goo.gl/omgl8 Here is a sanitised version of my windows.mrb file: screen -t local bash screen -t name1 ssh xxx@xxx screen -t name2 ssh root@xxx screen -t name3 bash Appreciate the time and effort. Cheers Brendan

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• Can "go" replace C++? [closed]

  - by iammilind

  I was reading wiki article about "go" programming language, where Bruce Eckel states: The complexity of C++ (even more complexity has been added in the new C++), and the resulting impact on productivity, is no longer justified. All the hoops that the C++ programmer had to jump through in order to use a C-compatible language make no sense anymore --they're just a waste of time and effort. Now, Go makes much more sense for the class of problems that C++ was originally intended to solve. Can go really replace C++(11) for new development in future? How about generic programming? I don't know go , but the amount of time (in)wasted in learning C++ seems to go in vain.

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• Xen 4.0.1 not booting with device not found error

  - by Disco

  I'm trying to get Xen 4.0.1 run as dom0 on a fresh/clean install of 10.10 desktop (x64). Followed the step by step tutorial at http://wiki.xensource.com/xenwiki/Xen4.0 I have the pvops kernel in /boot, also included the ext4 fs support by recompiling the kernel by : make -j6 linux-2.6-pvops-config CONFIGMODE=menuconfig make -j6 linux-2.6-pvops-build make -j6 linux-2.6-pvops-install Here's my grub entry : menuentry 'Xen4' --class ubuntu --class gnu-linux --class gnu --class os { recordfail insmod part_msdos insmod ext2 insmod ext3 set root='(hd0,msdos1)' search --no-floppy --fs-uuid --set 2bf3177a-92fd-4196-901a-da8d810b04b4 multiboot /xen-4.0.gz dom0_mem=1024M loglvl=all guest_loglvl=all module /vmlinuz-2.6.32.27 root=UUID=2bf3177a-92fd-4196-901a-da8d810b04b4 ro module /initrd.img-2.6.32.27 } blkid /dev/sda1 gives the : /dev/sda1: UUID="2bf3177a-92fd-4196-901a-da8d810b04b4" TYPE="ext3" My partition shemes is : /boot (ext3) / (ext4) Whatever option i've tried i end up with : mounting none on /dev failed: no such file or directory And message complaining that it cannot find the device with uuid ... It's taking my hairs out, if somone has a clue ...

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• Cook a SOA/BPM Development Environment with Chef in 8 minutes! By Jorge Quilcate

  - by JuergenKress

  After have installed Oracle SOA Suite once and over again, you start to finding out that these are boilerplate tasks and do not generate much value, because this are only the initial step to implement solutions with SOA and BPM. In this post I will show you how to automate these steps using Chef. Chef is a software provisioning tool that enable transform infrastructure as code. The goal is prepare a development environment with Oracle BPM Suite on Windows including the following components installed and configured: Oracle WebLogic Server 10.3.6 Oracle SOA Suite 11.1.1.7 (SOA, BPM and BAM) a BPM Domain with one server with SOA and BPM (Admin Server) and other server with BAM (optional) Read the complete article here. SOA & BPM Partner Community For regular information on Oracle SOA Suite become a member in the SOA & BPM Partner Community for registration please visit www.oracle.com/goto/emea/soa (OPN account required) If you need support with your account please contact the Oracle Partner Business Center. Blog Twitter LinkedIn Facebook Wiki Technorati Tags: Jorge Quilcate,Chef,SOA,BPM,SOA Community,Oracle SOA,Oracle BPM,Community,OPN,Jürgen Kress

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• How to play .mp4 movies?

  - by Andrew

  I have a .mp4 movie (it's an .mp4 file, and the "video codec" is Xvid, and the "audio codec" is mp3) that I want to play, but when I try to open it in MPlayer, it says "The steam is encrypted and decryption is not supported." I tried to apply the answer from this question and this wiki page, but neither worked. Any suggestions? The file came from an [apparently] less than reputable site, which I guess I can't link to. :( I've tried: sudo apt-get install ubuntu-restricted-extras sudo apt-get install libdvdread4 sudo /usr/share/doc/libdvdread4/install-css.sh sudo apt-get install gstreamer0.10-ffmpeg sudo apt-get install w64codecs sudo apt-get update

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• Dual Boot Ubuntu 12.04 on a Thinkpad T420 but keep recovery partition

  - by The PC Samurai

  I have a Thinkpad T420 which runs on Windows 7 Pro and I would like to install Ubuntu 12.04 on it via Dual Boot. But the thing is, I'd like to keep the Thinkvantage Recovery Partition. I've been researching and found this: Install Ubuntu on ThinkPad, recovery section must remain intact and http://www.thinkwiki.org/wiki/Rescue_and_Recovery But the information doesn't seem to be updated for for my situation (the second link indicates that it won't work with Windows 7). Just wonderin' if anyone already has experience doing this? I could create recovery CD/DVD's but I'll be more happy i can keep recovery partition and boot information on the hard drive functional (for future resale purposes). Any Ideas?

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• Where can I find more documentation on bulding an Ubuntu-based cloud infrastructure?

  - by Shazzner

  I've been reading: https://help.ubuntu.com/community/UbuntuCloudInfrastructure It's fascinating stuff, but documentation seems a bit sparse. Where I work, we have this aging, clunky VMWare ESXi setup for all our internal servers. I'd really like to read up on possible migration or just information on Orchestra, integration with Juju, etc that isn't a bunch of loosely connected blog posts. :p This is concerning 11.10 and, presumably, 12.04. To make this less vague, specifically documentation on: Orchestra - features, comparisons, videos, etc Integrating Juju with Orchestra - I'm familiar with using Juju for deploying on AWS, but that wiki page glances over connecting it to orchestra Building a private cloud - Advantages, using/deploying Openstack, etc Working with internal networks - Configuring DMZs, setting rules, etc Any recommended books would be appreciated too. I didn't intend for this to be a 'do all my homework for me! LMGTFY' post, I'm just hungry for information and haven't found a good repository of knowledge for much of this.

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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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• How Orchard works

  I just finished writing a long documentation topic on the Orchard project wiki that aims at being a good starting point for developers who want to understand the architecture, structure and general philosophy behind the Orchard CMS. It is not required reading for anyone who only wants to write Orchard modules and themes but hopefully it will help people who want to evaluate the platform and start writing patches. Read it here: http://orchardproject.net/docs/How-Orchard-works.ashx...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Online accounts advanced setting with Empathy (13.10)

  - by uruloke

  the new online accounts doesn't have the advanced settings as the empathy accounts had. How do i change the google server to connect to? i read here: https://wiki.gnome.org/Empathy/FAQ I can't connect to my Google Talk account Your router is probably blocking DNS SRV requests. If possible you should try to fix it. If you can't, the easiest work around is to set "talk.google.com" in the "Server" field of the advanced section of the account. So i think this might fix my problem, or maybe just an option to shift the port it connects to. and is there anyone that knows how to use join any IRC channels with Empathy? i have installed the plugin, but i don't know how to join a channel.

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• How can I install binutils from source?

  - by sven

  uname -a: Linux ubuntu 3.5.0-23-generic #35-Ubuntu SMP Thu Jan 24 13:05:29 UTC 2013 i686 i686 i686 GNU/Linux root@ubuntu:/home/ubuntu# apt-get source binutils Reading package lists... Done Building dependency tree Reading state information... Done E: Ignore unavailable target release 'stable' of package 'binutils' E: Unable to find a source package for I did apt-get update before typing the command. How can I get binutils? I am using Ubuntu 12.10. I am following the instruction on https://wiki.ubuntu.com/Toolchain/Crosscompilers/ARMEABIToolchain I am stuck at the first line. I did sudo add-apt-repository ppa:germia/archive3 previously, however I got some errors then, I did sudo add-apt-repository --remove ppa:germia/archive3 to undo the setting. I wonder if my problem is related wtih this PPA?

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• What IDEs are available for Ubuntu?

  - by Roland Taylor

  This question exists because it has historical significance, but it is not considered a good, on-topic question for this site, so please do not use it as evidence that you can ask similar questions here. See the FAQ for more information. This is a community wiki for IDEs available on Ubuntu. Please post one IDE per answer (including more than just a screenshot or a link, please at least put a short description). In your answer, tell us what the IDE is for (which language(s) or if it is RAD capable).

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• EclipseLink Moxy Provider for JAX-RS and JAX-WS

  - by arungupta

  EclipseLink MOXy is a JAXB provider bundled in GlassFish 3.1.2. In addition to JAXB RI, it provides XPath Based Mapping, better support for JPA entities, native JSON binding and many other features. Learn more about MOXy and JAXB examples on their wiki. Blaise blogged about how MOXy can be leveraged to create a JAX-WS service.You just need to provide data-binding attribute in sun-jaxws.xml and then all the XPath-based mapping can be specified on JAXB beans. MOXy can also be used as JAX-RS JSON provider on server-side and client-side. How are you using MOXy in your applications ?

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• FFMPEG compilation errors

  - by Nitin Sagar

  First of all i am a newbie to Ubuntu Linux and have been trying to install and compile FFMPEG on an Ubuntu machine... I am trying to compile FFMPEG on an Ubuntu machine, using the following link reference: https://ffmpeg.org/trac/ffmpeg/wiki/UbuntuCompilationGuide I have already install git packages from resource centre whatever it results in search... Whatever i am trying to clone to is showing the below error... and please note that the network is wireless and connected with full bandwidth and i am able to browse through website and not sure why its showing an error as unable to connect and connection timed out.... root@ubuntu:~# cd root@ubuntu:~# git clone --depth 1 git://github.com/mstorsjo/fdk-aac.git Cloning into 'fdk-aac'... fatal: unable to connect to github.com: github.com[0: 207.97.227.239]: errno=Connection timed out Tried these commands as well to install x264 lib: cd git clone --depth 1 git://git.videolan.org/x264 cd x264 I am doing all this as a root user. Any help and comments would be appreciated. Thanks Nitin

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• Storing and analyzing rock climbing difficulty

  - by Zonedabone

  I'm working on a WordPress plugin to manage rock climbing data, and I need to think of a way to store rock climbing grades from all of the different systems in a unified way. There are many different systems, all of which have some numerical system. A comparison of all the systems: http://en.wikipedia.org/wiki/Grade_(climbing)#Comparison_tables Is there some unified way that I can store and analyze these, or do I just need to assign numbers to them all and call it a day? My current plan is to save the score type and then assign each score a numerical value, which I can then use to compare and graph them.

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• Workaround the flip queue (AKA pre-rendered frames) in OpenGL?

  - by user41500

  It appears that some drivers implement a "flip queue" such that, even with vsync enabled, the first few calls to swap buffers return immediately (queuing those frames for later use). It is only after this queue is filled that buffer swaps will block to synchronize with vblank. This behavior is detrimental to my application. It creates latency. Does anyone know of a way to disable it or a workaround for dealing with it? The OpenGL Wiki on Swap Interval suggests a call to glFinish after the swap but I've had no such luck with that trick.

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