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Articles indexed in April 2012

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• I created a program based on an LGPL project, and I'm not allowed to publish the source code

  - by Dave

  I thought LGPL was a permissive license, just like MIT, BSD or Apache. But today I read, that only linking to LGPL (libraries etc) is allowed from closed-source code - other than that, it's copyleft - so I have to publish code that is based on an LGPL program. I created a program for my employer that is based on an LGPL program, but has considerable modifications to it. Of course, I am not allowed to put that modified source code out there. At the same time, I have to, if I distribute it (right?). So I wonder whether there is a workaround to this, so I can keep this closed-source (I wish I could publish the source) - any suggestions? My idea: can I put most functions of the original LGPL app into an external library, write the core executable from scratch, but refer back to the library for all functions that I haven't modified? Currently, everything is in a .jar file (it's Java/Swing). if you think my idea is legally/technically feasible - how much effort would it be to seperate what I wrote and what the original is? I'm not the most java savvy.

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• Disable Alt for window move in gnome-shell

  - by artfulrobot

  There are lots of posts on this about Unity, this is about gnome-shell As with other posters, I use apps (Inkscape in particular) that uses Alt-Click and Alt-drag. Gnome-shell is grabbing this off me and thus disabling features in the application. I have tried using ccsm's Move plugin - you can turn this off and you still get Alt-drag window moving. using gconf editor to change /apps/metacity/general/mouse_button_modifier - this has no effect AFAICS. It's really hindering me. Otherwise I find gnome-shell a really productive environment.

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• Touchpad won't work/not recognized on laptop, Ubuntu 11.10

  - by The_McManus_Position

  When I start out running 11.10 (Ocelot) from the Live CD the touchpad works with no problem. Once installing however the touchpad does not work at all. I have installed all updates available. I have tried installing the synaptiks touchpad package and the gpointer package from the software manager, this did not help. Under System Settings - Mouse and Touchpad there is only a mouse tab, no touchpad tab. It seems my touchpad is not even recognized. I have tried running several things in the terminal that I have found under similar questions, but I always get errors about the files not being found, or the drivers not being found. Have tried: sudo modprobe -r psmouse sudo modprobe psmouse proto=imps This results in an error message. dconf-editor Can load the GUI, but after that I can't seem to navigate through it to find the files that need editing. Read what's listed here. But I've got no GRUB, running only Ubuntu. As you can see I've been trying several things and nothing has worked so far, would appreciate any help. Thanks!

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• nouveu driver logs into unity-2d by default

  - by Ubuntuser

  I have an old system with NVIDIA Corporation NV25 [GeForce4 Ti 4600]. When running Ubuntu , the nouveau driver loads fine but does not log into Unity with compiz. Instead it logs into Unity-2D. Any idea how to enable 3D/ compiz with the nouveau driver. OS: Ubuntu 12.04 Beta2 The nvidia driver is no more available for this graphics card, so have to rely on nouveau. UPDATE: Bug reported on launchpad . See here. There has been no reply as yet to this bug-report - does anyone have any idea how to resolve this? Further information, Also, if I use kubuntu desktop, kwin graphics works just fine. But, the users prefer Unity over KDE so I have uninstalled Kubuntu.

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• HTTP(S) based file server

  - by Michael

  I've got a server running Ubuntu 10.04. I've already gotten openssh for ssh and sftp on it. I've been looking for a web-based (http, or preferably https) file server, perhaps a web-front-end to an (S)FTP server, that allows access to a specific folder, and also allows uploads. It requires user authentication, preferably using PAM. This web-based solution is for users that are not allowed to use FTP software / browser extension and don't have flash / java browser plugins within their corporate environments. So far I have looked into: Webmin: Includes a file manager, however it uses Java, and I'm looking for a plugin-free implementation. Apache2: I was able to set up https and PAM authentication, but the barebone implementation doesn't include file upload (as far as I'm aware of). HFS: Haven't tried it out because it is for Windows/wine only, and I don't want to run it under wine.

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• Not enough disk space '/' in AWS instance

  - by Sumant

  i am running Ubuntu 11.04 instance for my Web Server on AWS cloud, now i am getting there is no disk space in / partition of my server. df -ah say this Filesystem Size Used Avail Use% Mounted on /dev/xvda1 7.9G 7.8G 97M 99% / proc 0 0 0 - /proc none 0 0 0 - /sys fusectl 0 0 0 - /sys/fs/fuse/connections none 0 0 0 - /sys/kernel/debug none 0 0 0 - /sys/kernel/security none 3.7G 112K 3.7G 1% /dev none 0 0 0 - /dev/pts none 3.7G 0 3.7G 0% /dev/shm none 3.7G 80K 3.7G 1% /var/run none 3.7G 0 3.7G 0% /var/lock /dev/xvdb 414G 16G 377G 4% /mnt Now i have Tried these thing for getting some extra space on / partition Clean up All Log files for Apache. Removed all unnecessary files from server. Home directory Cleanup. But Still I am not getting enough space. This Instance type is m1.large with 8GB EBS. Now i am getting i have enough disk space in /dev/xvdb. Is there a way i can allocate some diskspace to / from /dev/xvdb or Any other Ways. Please suggest me the possible solution for this.Is it possible to use the same /dev/xvdb partition with another instance.

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• Forcing Nautilus to use Kerberos (Active Directory) authentication

  - by user14146

  Is there a way to get Nautilus or any other file manager that runs on Ubuntu 11.04 to use Kerberos for authentication? I'm using Likewise Open to join machines to the domain, and I can't type in passwords for every user on every computer that needs to mount a network share. I've been able to get Kerberos working with the command line smbclient, but oddly Kerberos does not seem to be Nautilus-integrated. I also checked the SSH config file, and it looks like you can enable GSSAPIAuthentication, but it only works for Kerberos v2, not the current version, which I think is v5.

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• Static Application Switcher is empty after show dekstop

  - by Jepzen

  Im using the Static Application Switcher to configure my ALT + TAB to cycle trough all applications not grouped. So far so good. Then I press Super + D to "hide all normal windows" (show desktop). This setting is from Keyboard - Shortcuts - Navigation. This also works BUT After hide all normal windows has been activated and I press ALT + TAB nothing comes up. I suspect they have been hidden so well that the Application Switcher does not longer sees them. Anyone know if this can be fixed trough settings somewhere?

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• Media Streaming Server

  - by Ehsan

  I'm looking for a media stream server (specially audio streams) for installing on my Ubuntu server box. Is there any lightweight, easy configurable solution? It's awesome if this solution is able to install on a high bandwidth server and gets a stream from a low bandwidth server and serves it for many clients. (simply because the original server hasn't enough BW to serve media for many clients) (My server is a LAMP server, but I'm looking for a good solution for one of my clients to stream his audio for one hour every week)

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• how to install monitorx in ubuntu 11.10 amd64

  - by blade19899

  I followed a tutorial at unixmen on how to install monitorx in ubuntu i installed the dependencies and downloaded the monitorix_2.5.0-izzy1_all.deb deb package but when i try to install it i get this error google transtaler (i have a dutch Ubuntu and so was the error message) dpkg: error processing monitorix_2.5.0-izzy1_all.deb (- install): parsing file '/ var / lib / dpkg / tmp.ci / control' near line 14 package 'monitorix': blank line in the value of field 'Description' Errors were encountered while processing: monitorix_2.5.0-izzy1_all.deb my question is how to get monitorx up and running in Ubuntu 11.10 amd64

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• Newly compiled (patched with -ck) 3.3 kernel won't boot up

  - by Shiki

  Screen is garbled. Reaaaally garbled. Like some sort of scrambling image from a movie. I can upload some pictures if needed. To be short with the description. Here is my 3.3 + ck .config file: http://pastebin.com/aP2F9RcH The dmesg log of the failed kernel: http://pastebin.com/esc2Rtka The computer is a ThinkPad T500 laptop. I have selected everything needed for the computer (as far as I can tell, but check the .config). The normal generic Ubuntu kernel boots and works perfect!

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• connecting ubuntu with 7 via network cable

  - by VeXe

  i was tryin to connect my ubuntu toshiba satalite L650 laptop with my desktop via a network cable so that i can share things and remotely control the desktop from the laptop, i googled the problem out and found a guide page , i followed all the steps , i installed samba, i had the two computer have the same workgroup name , i had everything correct, but i still dont see connection estbalished between the two computers, (neither one is visible to the other) what is missing ? thanx in advance.

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• "Ubuntu One" Value could not be retrieved. (ValueError: cannot convert float NaN to integer)

  - by SimoneRaso

  When I try to start Ubuntu one (after the registration) I receive the this error. Plus it keeps saying "loading.." I am using Ubuntu 11.10 freshly installed. I've try to reinstall ubuntuone after remove them from "ubuntu software center" and remove all the entri ubuntuone* from synaptic. Only the last slice of the ubuntu one control panel seems responding and display "Value could not be retrieved. (ValueError: cannot convert float NaN to integer)". After I reinstall completely ubuntu and when I retry, receive the same. tank's

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• Fixing dpkg after installation of broken packages? [closed]

  - by Amith KK

  Possible Duplicate: How to remove all associated files and configuration settings of an app installed through 'force architecture' command I installed a broken package, and now apt-get/aptitude is failing with trying to remove it Each time I run a apt operation, this is the message I get: Removing crossplatformui ... ztemtvcdromd: no process found dpkg: error processing crossplatformui (--remove): subprocess installed post-removal script returned error exit status 1 No apport report written because MaxReports is reached already Errors were encountered while processing: crossplatformui E: Sub-process /usr/bin/dpkg returned an error code (1) running sudo apt-get install -f gives me this: amith@amith-desktop:~$ sudo apt-get install -f Reading package lists... Done Building dependency tree Reading state information... Done The following packages will be REMOVED: crossplatformui 0 upgraded, 0 newly installed, 1 to remove and 1123 not upgraded. 1 not fully installed or removed. After this operation, 0 B of additional disk space will be used. Do you want to continue [Y/n]? Y (Reading database ... 340804 files and directories currently installed.) Removing crossplatformui ... ztemtvcdromd: no process found dpkg: error processing crossplatformui (--remove): subprocess installed post-removal script returned error exit status 1 Errors were encountered while processing: crossplatformui E: Sub-process /usr/bin/dpkg returned an error code (1) How do I fix this?

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• How to Disable Touchpad tap in Toshiba Tecra R850 in Oneiric - it is recognized as a PS/2 mouse

  - by Kibi

  I know there's a lot of similar questions, but nothing I have tried here works yet - perhaps I was doing it wrong. New Laptop - Toshiba Tecra R850 with an install of Oneiric 64 bit. Mostly things are working well, but I have a problem with the touchpad (or whatever it's called) - whenever I use it for moving the mouse pointer I accidentally tap on it - basically I am clicking all over the place by accident. So I want to disable the tap-as-click (after all, I have buttons for clicks too). I open up "Mouse and Touchpad" and on the Touchpad tab I check "Disable touchpad when typing" and UNcheck "Enable mouse clicks with touchpad". This does not achieve anything. Ditto Synaptiks and other similar tools. EDIT OK it turns out that this is a somewhat known problem - it seems the touchpad is not being recognized as a touchpad, it is seen as a PS/2 mouse. So any adjustments made with various settings programs to the "touchpad" don't affect it. I've been looking at solutions for getting the touchpad correctly recognized and not achieved it yet - seems there is a problem at the kernel level...I tried (foolishly) a suggestion to replace the psmouse.ko driver ...this screwed some stuff up and didn't solve my problem. So - anyone know an answer? Thanks Kibi

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• Shutdown issue on persistent LiveUSB

  - by John K

  A) Downloaded Ubuntu to a Windows 7 temp directory from: http://www.ubuntu.com/download/ubuntu/download (Ubuntu 11.10 - Latest version / 32-bit). The output was a .iso file. B) Created a bootable USB stick using Universal USB Installer: http://www.pendrivelinux.com/universal-usb-installer-easy-as-1-2-3/. Did not select "Persistent file". Result: Tried it in a Dell Latitude D630 Dell laptop: works every time, many startups and shutdowns. C) Repeated B) but with "Persistent file" set. Works once or twice, but then, just locks on the Ubuntu splash screen. E) Downloaded LiveUSB Install from http://live.learnfree.eu/download, which created a file on Windows 7 called live-usb-install-2.3.2.exe. F) Ran the above installer with "Persistent file" to a 4GB ScanDisk (formatted) thumb drive. Result: Worked pretty good for a while. Shutdown and rebooted several times. Changed items like creating a new directories - all worked. Then: Setup an Admin account with a password and no auto login. On next reboot, it required the password and logged in correctly. Tried to shutdown via the top left icon - Shutdown menu option. Key issue: Would not shutdown, but would always go back to the login prompt. Could successfully login. Finally, shutdown (which just put me back to the login window), and hard shutdown with the power switch. Result: On reboot, just locks on the Ubuntu splash screen. Questions (note, very new to Linux): Did I shutdown wrong (I mean prior to the hard power off)? Is the persistence option very unstable, or am I doing something else completely wrong?

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• Pc won't start after installing latest version of ubuntu

  - by sotos bic

  Pc won't start after installing latest version of ubuntu . I press the button to start the pc and then i see the bios start but after that i get a black screen and nothing is happening. i can't even re install windows 7 or choose between windows 7 and linux . Please help i don't want to pay for fixing this . I don't remember the hardware and since i can't access windows 7 i can't tell you. the only thing that i know is that it is an hp compaq 500bmt

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• How to handle canonical url changes like Stack Overflow

  - by lulalala

  Stack Overflow sites all have pretty urls which include the question title. In the HTML it also have canonical url for that page. I just found out that when I change the question title, the url is changed immediately. The canonical url is also updated. Does it mean that as long as the page with the old canonical url redirects to the new canonical url, then search engines will update their records of the canonical url as well? Is there anything else that one can actively do to make the url change even more smoother?

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• Do any CDN services offer multiple urls (or aliases) for your files?

  - by Jakobud

  Lets say a company has multiple commercial web properties that happen to use a lot of the same images on each site. For SEO reasons, the sites must not appear to be related to eachother in any way. This means that the sites can't all link to the same image, even though they all use the same one. Therefore, an image is uploaded to each site and served from each site separately. In order to improve maintainability and latency, lets say the company wanted to use a CDN service. What I'm wondering is, if you upload a file, like an image or something, to a CDN, is there basically one single URL that you access that image at? Or do some (or all) CDN services offer alias URLs so that you can access the same resource from multiple URLs? Example of undesirable situation: Both sites link to the same file URL Site ABC links to <img src="http://123.cdnservice.com/some-path/myimage.jpg"/> Site XYZ links to <img src="http://123.cdnservice.com/some-path/myimage.jpg"/> Example of DESIRABLE situation: Both sites link to the same file via different URLs Site ABC links to <img src="http://123.cdnservice.com/some-path/myimage.jpg"/> Site XYZ links to <img src="http://123.cdnservice.com/some-alias-path/myimage.jpg"/> So in the end, there is only one single file, myimage.jpg on the CDN server, but it is accessible from multiple URLs. Is this possible with CDN services? I know this would make browsers cache the same image twice, but at least it would be better for maintainability. Only one file would ever have to be uploaded.

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• how to use string::find to look for a word rather each character seperately

  - by RubyKing

  Hello how would I look through a string for a word rather then each character in that word. I have my code here and it always seems to find everything that is .obj even if its o or b or j or "." is there anyway to get passed this here is my code? I checked the docuementation here link but nothing returned any results I craved so hard string &str = *it; if(it->find(".obj")) { cout << "Found .Obj" << endl; } I also tried to use string::compare but that failed :(

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• A* PathFinding Not Consistent

  - by RedShft

  I just started trying to implement a basic A* algorithm in my 2D tile based game. All of the nodes are tiles on the map, represented by a struct. I believe I understand A* on paper, as I've gone through some pseudo code, but I'm running into problems with the actual implementation. I've double and tripled checked my node graph, and it is correct, so I believe the issue to be with my algorithm. This issue is, that with the enemy still, and the player moving around, the path finding function will write "No Path" an astounding amount of times and only every so often write "Path Found". Which seems like its inconsistent. This is the node struct for reference: struct Node { bool walkable; //Whether this node is blocked or open vect2 position; //The tile's position on the map in pixels int xIndex, yIndex; //The index values of the tile in the array Node*[4] connections; //An array of pointers to nodes this current node connects to Node* parent; int gScore; int hScore; int fScore; } Here is the rest: http://pastebin.com/cCHfqKTY This is my first attempt at A* so any help would be greatly appreciated.

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• Anti-aliasing works for debug runtime but not retail runtime

  - by DeadMG

  I'm experimenting with setting various graphical settings in my Direct3D9 application, and I'm currently facing a curious problem with anti-aliasing. When running under the debug runtime, AA works as expected, and I don't have any errors or warnings. But when running under the retail runtime, the image isn't anti-aliased at all. I don't get any errors, the device creates and executes just fine. As I honestly have little idea where the problem is, I will simply give a relatively high-level overview of the architecture involved, rather than specific problematic code. Simply put, I render my 3D content to a texture, which I then render to the back buffer. Any suggestions as to where to look?

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• How to move the camera sideways in libgdx

  - by Bubblewrap

  I want to move the camera sideways (strafe/truck), now i had the following in mind, but it doesn't look like there are standard methods to achieve this in libgdx. If i want to move the camera sideways by x, i think i need to do the following: Create a Matrix4 mat Determine the orthogonal vector v between camera.direction and camera.up translate mat by v*x multiply camera.position by mat Will this approach do what i think it does, and is it a good way to do it? And how can i do this in libgdx? I get "stuck" at step 2, as in, i have not found any standard method in libgdx to calculate an orthogonal vector. EDIT: I think i can use camera.direction.crs(camera.up) to find v. Guess i can now try this approach tonight and see if it works.

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• Early Z culling - Ogre

  - by teodron

  This question is concerned with how one can enable this "pixel filter" to work within an Ogre based app. Simply put, one can write two passes, the first without writing any colour values to the frame buffer lighting off colour_write off shading flat The second pass is the one that employs heavy pixel shader computations, hence it would be really nice to get rid of those hidden surface patches and not process them pixel-wise. This approach works, except for one thing: objects with alpha, such as billboard trees suffer in a peculiar way - from one side, they seem to capture the sky/background within their alpha region and ignore other trees/houses behind them, while viewed from the other side, they exhibit the desired behavior. To tackle the issue, I thought I could write a custom vertex shader in the first pass and offset the projected Z component of the vertex a little further away from its actual position, so that in the second pass there is a need to recompute correctly the pixels of the objects closest to the camera. This doesn't work at all, all surfaces are processed in the pixel shader and there is no performance gain. So, if anyone has done a similar trick with Ogre and alpha objects, kindly please help.

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• 2D XNA Tile Based Lighting. Ideas and Methods

  - by Twitchy

  I am currently working on developing a 2D tile based game, similar to the game 'Terraria'. We have the base tile and chunk engine working and are now looking to implement lighting. Instead of the tile based lighting that terraria uses, I want to implement point lights for torches, etc. I have seen Catalin Zima’s shader based shadows, and this would be perfect for the torches (point lights). My problem here is that the tiles on the surface of the world need to be illuminated, doing this by a big point light is firstly extremely expensive, but also doesn't look right. What I need help with (overall) is... To have a surface that is illuminated regardless of torches, etc. To also have point lights, or smooth tile lighting similar to Catalin Zima’s shader based shadows. Looking forward to your replies. Any ideas are appreciated.

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