Alex Sleat » error

AL lib: pulseaudio.c:331: PulseAudio returned minreq > tlength/2; expect break up – Ubuntu 11.10

Alex — Wed, 11 Jan 2012 23:49:56 +0000

./blender
connect failed: No such file or directory
ndof: spacenavd not found
AL lib: pulseaudio.c:331: PulseAudio returned minreq > tlength/2; expect break up
Floating point exception

Download and install the associated package to your processor from here : https://launchpad.net/ubuntu/oneiric/+package/python-openal

Restart your computer and the issue should now be resolved.

OpenNI – error CS0006: cannot find metadata file `System.Windows.Forms.dll’

Alex — Thu, 01 Dec 2011 13:41:37 +0000

During installing the OpenNi kinect drivers, found here: https://github.com/OpenNI/OpenNI, I came across this error:

make[1]: Entering directory `/home/alex/kinect/OpenNI/Platform/Linux-x86/Build/Samples/SimpleViewer.net’
gmcs -out:../../../Bin/Release/SimpleViewer.net.exe -target:winexe -unsafe -o+ -r:OpenNI.net.dll -r:System.Windows.Forms.dll -r:System.Drawing.dll -lib:../../../Bin/Release ../../../../../Samples/SimpleViewer.net/*.cs ../../Res/AssemblyInfo-OpenNI.cs
error CS0006: cannot find metadata file `System.Windows.Forms.dll’
Compilation failed: 1 error(s), 0 warnings
make[1]: *** [../../../Bin/Release/SimpleViewer.net.exe] Error 1
make[1]: Leaving directory `/home/alex/kinect/OpenNI/Platform/Linux-x86/Build/Samples/SimpleViewer.net’
make: *** [Samples/SimpleViewer.net] Error 2

To fix it, simply install the following package:

sudo apt-get install mono-complete

Once finished, re-make and make install and everything should be dandy!

ROS – rviz X Window System error.

Alex — Tue, 29 Nov 2011 10:15:12 +0000

rosrun rviz rviz
[ INFO] [1322561467.803234807]: rviz revision number 1.6.7
[ INFO] [1322561467.803351442]: ogre_tools revision number 1.6.2
[ INFO] [1322561467.803374070]: compiled against OGRE version 1.7.3 (Cthugha)
[ INFO] [1322561467.946771146]: Loading general config from [/home/alex/.rviz/config]
[ INFO] [1322561467.946953292]: Loading display config from [/home/alex/.rviz/display_config]
[ INFO] [1322561467.972674791]: RTT Preferred Mode is PBuffer.
The program ‘rviz’ received an X Window System error.
This probably reflects a bug in the program.
The error was ‘BadDrawable (invalid Pixmap or Window parameter)’.
(Details: serial 22 error_code 9 request_code 137 minor_code 3)
(Note to programmers: normally, X errors are reported asynchronously;
that is, you will receive the error a while after causing it.
To debug your program, run it with the –sync command line
option to change this behavior. You can then get a meaningful
backtrace from your debugger if you break on the gdk_x_error() function.)

I got this error when I incorrectly compiled rviz using:

rosmake rviz rviz

You’ll want to re-compile it correctly, with only 1 input as followed:

rosmake rviz

Now when you run it, everything should be working.

Steam in Wine, Repeated Windows

Alex — Fri, 01 Jul 2011 23:08:29 +0000

After installing Steam on my linux machine in wine I noticed a really annoy bug, the windows of steam are tiled across my screen as shown in the screenshot below.

Fix:

I managed to fix this by opening up the ‘Configure Wine’ program that comes with wine and under the Applications tab switching from Windows XP mode to Windows 7, this fixed this bug and I now also have system borders on the steam windows.

Installing Wine:

If you’re interested in getting steam installed I used this guide - https://wiki.ubuntu.com/UbuntuMagazine/HowTo/InstallingSteam – It’s pretty simple and only takes a few minutes to do. Below is a quick, simple breakdown of what that guide says to do.

Download wine:

sudo apt-get install wine

Download the steam installer from here:

http://www.steampowered.com/v/index.php

Copy over the tahoma.ttf font from a Windows install (or Download it here – http://source.winehq.org/source/fonts/tahoma.ttf ). Do this command from the folder you downloaded the font to.

cp tahoma.ttf ~/.wine/drive_c/windows/fonts/

(If it doesn’t work and says the folder is missing or somthing like that do the following and then re-do the cp)

mkdir ~/.wine/drive_c/windows/fonts/

Finally install Steam (Do this command in the directory you downloaded the Steam installer to):

msiexec /i SteamInstall.msi

GitHub: Agent admitted failure to sign using the key.

Alex — Thu, 16 Jun 2011 21:52:16 +0000

Upon testing my GitHub setup on my home computer I got the following error after inputting this:

ssh git@github.com

Returned:

Agent admitted failure to sign using the key.
Permission denied (publickey).

You’ll need to run:

ssh-add ~/.ssh/id_rsa

Make sure to enter the passphrase for the ssh key you generated.

How To Fix: Error: Cannot retrieve repository metadata (repomd.xml) for repository: Dropbox. Please verify its path and try again

Alex — Tue, 24 May 2011 16:56:04 +0000

After installing dropbox from the RPM package availble on the site on a new Fedora 15 install, I was unable to use yum without coming across this error:

$ update
Loaded plugins: langpacks, presto, refresh-packagekit
http://linux.dropbox.com/fedora/15/repodata/repomd.xml: [Errno 14] HTTP Error 404 – Not Found : http://linux.dropbox.com/fedora/15/repodata/repomd.xml
Trying other mirror.
http://linux.dropbox.com/fedora/15/repodata/repomd.xml: [Errno 14] HTTP Error 404 – Not Found : http://linux.dropbox.com/fedora/15/repodata/repomd.xml
Trying other mirror.
Error: Cannot retrieve repository metadata (repomd.xml) for repository: Dropbox. Please verify its path and try again

For some unknown reason dropbox repos dont seem to work past 13 so you’ll need to change the dropbox.repo file from detecting the current release to 13 like so:

Open the dropbox.repo file:

sudo gedit /etc/yum.repos.d/dropbox.repo

Change the baseurl from $relesever to 13 like so:

Original:

[Dropbox]
name=Dropbox Repository
baseurl=http://linux.dropbox.com/fedora/$releasever/
gpgkey=http://linux.dropbox.com/fedora/rpm-public-key.asc

New:

[Dropbox]
name=Dropbox Repository
baseurl=http://linux.dropbox.com/fedora/13/
gpgkey=http://linux.dropbox.com/fedora/rpm-public-key.asc

Save and close and everything should be working, try using sudo yum update to check and the error should have gone away. If not give a reboot a try.

Error: “end_request: I/O error, dev sr0, sector xxxxx” – Linux

Alex — Sun, 20 Mar 2011 14:46:49 +0000

Error:

end_request: I/O error, dev sr0, sector 537392

If you’re getting a similar error filling your screen once you’ve installed Ubuntu, don’t panic. It’s pretty common which is basically because Ubuntu (or any other Linux distro) can’t control your CD/DVD drive properly, it’s probably trying to open/close it but doesn’t know if it has or not. The problem is that you don’t get to see what Ubuntu wrote before because it’s filled your screen up with this error.

If you’ve just installed Ubuntu this probably happened when it wanted you to take the disc out and close the cd tray (if there is one) then hit Enter to finish the installation, so just do that and ignore this error.

Failed to build Planner-0.14.4 in Arch Linux

Alex — Mon, 14 Mar 2011 10:35:43 +0000

When trying to install Gnome Planner ( http://live.gnome.org/Planner ) in Arch Linux, I came across this error:

Error:

/usr/bin/pygobject-codegen-2.0: line 11: /usr/bin/python2: No such file or directory
make[2]: *** [planner.c] Error 127
make[2]: Leaving directory `/home/alex/Desktop/planner-0.14.4/python‘
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/alex/Desktop/planner-0.14.4′
make: *** [all] Error 2

To fix this, I made a symbolic link from /usr/bin/python2.7 to /usr/bin/python2, this should work with other similar errors involving missing python2 file.

sudo ln -s /usr/bin/python2.7 /usr/bin/python2

Once you have made the made the symbolic link continue to make and install the program as usual.

How To Fix: fatal error: Python.h: No such file or directory

Alex — Sat, 01 Jan 2011 13:41:46 +0000

(cd ./brain/psom && make)
make[1]: Entering directory `/home/ubuntu/pyrobot/brain/psom‘
(cd csom_src && make _csom.so)
make[2]: Entering directory `/home/ubuntu/pyrobot/brain/psom/csom_src’
gcc -c -g -I -I/usr/include/python2.6 som_pak_wrap.c -I/usr/include/python2.6 -Isom_pak-dev
som_pak_wrap.c:125: fatal error: Python.h: No such file or directory
compilation terminated.
make[2]: *** [som_pak_wrap.o] Error 1
make[2]: Leaving directory `/home/ubuntu/pyrobot/brain/psom/csom_src‘
make[1]: *** [csom_src/_csom.so] Error 2
make[1]: Leaving directory `/home/ubuntu/pyrobot/brain/psom’
make: *** [brain/psom] Error 2

To fix

sudo apt-get install python2.6-dev

Ubuntu Disconnecting from Wi-Fi and Failing to Reconnect.

Alex — Fri, 05 Nov 2010 09:43:57 +0000

I have an updated fix for this issue using a startup script to connect and a time scheduled script for checking the connection, rather than having one constantly running in the background, avalible here – http://alexsleat.co.uk/2011/01/09/a-more-elegant-solution-to-ubuntu-wi-fi-reconnecting-issue/

I’ve been having some trouble with my wifi on Ubuntu recently but I think it’s because I’m almost out of range of the access point. The problem is that once it disconnects it never seems to be able to reconnect unless wireless is disabled and re-enabled. No doubt there is another way of fixing this issue but it gives me a chance to write my first shell script.

In short the script disables network-manager (it was trying to do things auto which was screwing with things), sets up the connection and connects then checks for a string in the wireless card parameters which will only occur if it’s disconnected, if the string appears it’ll disable and re-enable the wireless device which seems to allow it to connect again. If it’s connected it’ll wait 3 minutes (180 seconds) before checking again where as if it does disconnect it’ll check again 30 seconds after it’s tired rebooting the device.

Here’s the script, be sure to try it if you’re having the same problem (you might need to change the wireless device ‘wlan1′ to yours) and comment if I’m doing something wrong or there’s another way around this, cheers.

#!/bin/bash

service network-manager stop

iwconfig wlan1 essid NETWORKNAME
iwconfig wlan1 key NETWORKKEY
ifconfig wlan1 up
dhclient3 wlan1

while true;
do

if (iwconfig wlan1) | grep -o "Access Point: Not-Associated"
then
ifconfig wlan1 down
echo "not connected, rebooting Wifi"
ifconfig wlan1 up
sleep 30
else
echo "connected"
sleep 180
fi

done