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Linux Ubuntu

gimp: error while loading shared libraries: libgegl-0.0.so.0: cannot open shared object file: No such file or directory

After upgrading from Ubuntu 11.10 to 12.04 I found gimp couldn’t access the shared libraries it needed, most likely an error with symbolic links as described by lovelyindia in this post.

Fix 1:

He managed to fix the issue by removing gimp and purging the offending libraries and then letting apt deal with the libraries when he re-installed gimp, as per the below commands:

sudo apt-get update 
sudo apt-get purge gimp libgegl* libbabl* 
sudo apt-get install gimp 
sudo apt-get clean

While this is likely to work for most people encountering this issue, it didn’t for me.

Fix 2:

Then I remembered I had used the repogen source list generator, in which I chose to include the gimp svn build. While you may not have gone about it the same way, you may also have a different repository in your sources.list file which is causing this issue, if the previous method did not resolve the issue.

In order to fix this, I had to open the sources.list file and comment out the offending repo.

sudo gedit /etc/apt/sources.list

Now search for any reference to gimp, in my case this was the lines I changed:

#### Gimp SVN - https://launchpad.net/~matthaeus123/+archive/mrw-gimp-svn
## Run this command: sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 405A15CB
deb http://ppa.launchpad.net/matthaeus123/mrw-gimp-svn/ubuntu precise main

I commented out the line linking to the repo by adding a ‘#’ to the front, as below:

#### Gimp SVN - https://launchpad.net/~matthaeus123/+archive/mrw-gimp-svn
## Run this command: sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 405A15CB
# deb http://ppa.launchpad.net/matthaeus123/mrw-gimp-svn/ubuntu precise main

I then uninstalled gimp, once I knew it may have been the newly added repository that I had added:

sudo apt-get purge gimp

Then I saved and exited the file and updated apt:

sudo apt-get update

I then re-installed gimp:

sudo apt-get install gimp

This solved the issue for me, I hope this helps!

Categories
Featured Linux Ubuntu

Toggle Touchpad With Keyboard Shortcut in Ubuntu

Install Jupiter

Instructions for Ubuntu 11.10, 11.04, 10.10, 10.04: http://www.webupd8.org/2011/09/jupiter-applet-finally-available-for.html

sudo add-apt-repository ppa:webupd8team/jupiter 
sudo apt-get update 
sudo apt-get install jupiter

Jupiter comes with a useful script to disable and re-enable the touchpad/track pad, it can be ran using the following command:

sudo /usr/lib/jupiter/scripts/touchpad

Now all you’ll need to do is add this command to a keyboard shortcut, below are instructions for several desktop environments.


In xfce:

Applications > Settings > Settings Manager

Click Keyboard

Click on the “Applications Shortcuts” tab.

Click Add:

Here you will be promped with a new window asking for the command you wish to run, enter the following:

sudo /usr/lib/jupiter/scripts/touchpad

Click OK and it will now ask for a keyboard shortcut. Simply press the key combination you want to assign to disabling the touchpad (for example, I used Alt+F1) the keys you’re pressing will show up and the window will close.

You’ll now see the command and shortcut in the list and you can now press that key combo to disable the trackpad and press it again to re-enable it.


In Gnome:

In Unity:

bish bash bosh.

Categories
Command Line Linux Ubuntu

Ubuntu 11.10 Proxy Settings

Temporary proxy:

Where proxy.addr is the proxy address, 4040 is the port number. Some proxies may require “http://” before the address.

export http_proxy="proxy.addr:4040"
export ftp_proxy="proxy.addr:4040"
export https_proxy="proxy.addr:4040"

If you run this in a terminal, any programs opened from that terminal will adhere to the proxy you set but any other applications will not. This makes it useful if you just want to launch a browser for a quick browsing session but don’t need the whole system to access the internet.

If you do need your entire system to access the network, you can add these to the bottom of “~/.bashrc” this will enable any new programs running and the whole system (after a restart) to use the settings. Essentially ~/.bashrc are commands run when a terminal is opened.

NOTE: If you do this, when you remove them your machine will likely need a restart to undo the changes.


Proxy with login

If your proxy server requires a login, this is an addition of the above however the syntax is as follows:

user:pass@proxy.addr:4040

APT Proxy:

APT (used for system updates) has its own proxy settings, which seem to ignore the above settings.

Where nano is the editor, if you prefer use a graphical one such as gedit, kedit etc.

sudo nano /etc/apt/apt.conf.d/02proxy

add:

Acquire::http::Proxy "http://proxy.addr:4040";

Source : http://naveenubuntu.blogspot.com/2011/09/updating-packages-behind-prxy-in-ubuntu.html

Categories
Linux Ubuntu

HP Pavilion dm1 (E-450/HD 6320) and Ubuntu 11.10

Wireless (BMC4313) Drivers:

There seems to be some issues with the current range of broadcom drivers, there are several options and some barely work and give very poor wireless signal and flaky connections.

Check you wireless card
lspci | grep Broadcom

Output:

03:00.0 Network controller: Broadcom Corporation BCM4313 802.11b/g/n Wireless LAN Controller (rev 01)
Installation:

There are two options here:

Option 1

You should also be able to use the drivers in Additional Drivers, the “Broadcom STA proprietary wireless driver”, however before doing this you need to run these commands to install the required headers and tools as it seems this step was missed out:

sudo apt-get install build-essential linux-headers-generic
sudo apt-get build-dep linux

To check to see if you have this directory do this:

ls /lib/modules/`uname -r`/build

Now go to Settings > Additional Drivers and simply click install on the “Broadcom STA proprietary wireless driver”, reboot and you should experience much better wireless signal and connection stability.

Option 2

If this doesn’t work for you un-install those drivers and download the source drivers and build them from source and this works well, these can be found here: http://www.broadcom.com/support/802.11/linux_sta.php.

 


Graphics (HD 6320) Drivers:
Installation:

These can be found in Settings > Additional Drivers.

Install and reboot.

NOTE: This driver doesn’t account for sound over HDMI, the sound will continue to come out of the speakers. I’m looking in to a fix for this.

Fixing the “AMD Ubsupported hardware” Watermark:

You’ll probably now notice a watermark at the bottom right hand of the screen, reading “AMD Ubsupported hardware”. While the drivers are working away, they seem to think it’s unsupported. You can either remove the propriotry drivers and use the open source version. Or you can run the following script (found here) to remove it:

[gist][/gist]

To run, either right click and save as on the link to “view raw” or copy and paste in to a file and save the file as “fixwatermark.sh”

Make executable:

chmod +x fixwatermark.sh

Run:

sudo ./fixwatermark.sh

(Thanks to Andy pointing out in his comment, this needs to be run as root (I’ve added the sudo above).
Reboot your system and the driver will still be running but the watermark will be removed.

Categories
Linux Ubuntu

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

./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.

Categories
Arch Linux Fedora HowTo Linux Ubuntu

Heat Management in Linux

When you first switch from Windows or OSX to Linux, one of the things you’ll probably first notice (especially if you’re using a laptop) is that it can run considerably hotter than the alternatives. There are a few things you can do to remedy this, however. The following software packages help you keep track of and cool down your laptop/netbook, how much will depend per machine but my HP Pavilion dm1 goes from around 60-70degrees without these tools installed to around 50-60degrees and the same goes for my older Acer Travelmate which dropped from 70-80degrees to 60-70degrees. Hopefully this information will help you shave off 10degrees from your laptop, making it cooler, easier to use and hopefully extending its life a little too!

lm-sensors

First thing that you’re going to want to do is be able to see what the temperature readings of the components (that have temperature sensors) inside your computer/laptop. This can be done by installing lm-sensors:

sudo apt-get install lm-sensors

Now you’ll want to run the script which probes all the possible sensors in your laptop:

sudo sensors-detect

You’ll be asked if you want to scan for sensors and what not, follow the on-screen instructions, mostly just pressing enter, if YES is written in capitals this is the default answer and it will scan. After several times it’ll ask you if you want to save the changes, make sure you do and then you’re done.

Now you can see the temperature the sensors are reading by using the following command:

sensors
cpufreq

cpufreq is a utility which scales the frequency of the CPU, either by monitoring the systems status (if it needs more, it’ll get more) or by user controlled settings. This essentially underclocks the CPU while it isn’t in use, reducing power usage and thus heat.

Installation:

sudo apt-get install cpufreq

The best choice would be to set cpufreq to on-demand (default) or to power-saving. Alternatively, if you’re using a laptop or netbook let jupiter take care of it for you:

jupiter

Jupiter is a light weight power and hardware control applet for Linux. It is designed to improve battery life of a portable Linux computer by integrating with the operating system and changing parameters of the computer based on battery or powered connection.

Additionally, Jupiter provides quick access to some of the commonly needed hardware controls like screen output and resolution, WIFI, and bluetooth.

If you use Linux on a portable computer, let Jupiter take the effort out of going mobile.

By using this to intelligently control the CPU frequency when on battery and AC along with the tuning to the kernel and hardware, it can make a huge difference to the temperature expelled by your laptop.

Ubuntu 11:10 installation instructions: here

Graphics Card Drivers

If you have a dedicated graphics card in your laptop, you’ll also be better off installing the proprietary graphics drivers provided by the hardware vendor. While the open source ones do an awesome job of getting the card to work, more often than not they don’t include any control over the frequency scaling and keep the card running at max, along with all those other little features the card has, they’ll probably all always be running.

Nvidia : Link
ATI/AMD : Link

Categories
HowTo Linux Ubuntu

Updating The Kernel in Ubuntu

Download the latest from here:

http://kernel.ubuntu.com/~kernel-ppa/mainline/

The folders correspond to kernel versions and should also include the ubuntu version, for example I chose to update 11.10 (oneiric) from “3.0.0-14-generic” to “3.1.4”, this was in a directory called “v3.1.4-oneiric/“.

You’ll need 3 files (replace * with the kernel version you’ve downloaded):

linux-headers-*_all.deb

For 64 bit systems (replace * with the kernel version you’ve downloaded):

linux-headers-*_amd64.deb
linux-image-*_amd64.deb

For 32 bit systems (replace * with the kernel version you’ve downloaded):

linux-headers-*_i386.deb
linux-image-*_i386.deb

Once you have the files, install them in the following order using these commands (of course, replacing the version number for the ones you’ve downloaded):
sudo dpkg -U linux-headers-3.1.4-030104_3.1.4-030104.201111281851_all.deb
sudo dpkg -U linux-headers-3.1.4-030104-generic_3.1.4-030104.201111281851_amd64.deb
sudo dpkg -U linux-image-3.1.4-030104-generic_3.1.4-030104.201111281851_amd64.deb

Once that’s done, reboot. Once you’re back use the following command to check that the kernel you’re using is the one you’ve just downloaded and installed!

uname -r
Categories
Linux Posts

“Look of disapproval” not correctly displayed in Ubuntu / Linux Mint

If internet memes such as the following are displaying as squares rather than the faces they should be, it’s because Ubuntu/Linux Mint doesn’t come with the correct font packages.

ಠ_ಠ

To install these packages, simply install “unifont”:

sudo apt-get install unifont

If you’re having trouble in other distros, just search for the unifont package and install in that (might be named slightly differently.)

Categories
Arch Linux Fedora HowTo Linux Posts Ubuntu

Setting Up Surround Sound in Linux

It’s been a while since I bothered, the reason being it’s always seemed like an un-worthwhile struggle to get it working but either things changed or I was doing something to overcomplicate the process but it’s actually pretty simple to get surround sound up and running on your Linux machine. Now, I’m not going to go in to how to install the drivers for your specific sound card, because there are so many and I don’t have them all and most times on most popular distributions (Debian, Ubuntu, Mint, Fedora, OpenSuse etc) you’re going to notice that the sound card is actually already supported. What I will be doing is showing you how easy it was to get my 5.1’s set up (and the same will be said for 7.1’s).

Step 1:

First off you’re going to want to edit the pulseaudio configuration file to add the number of speakers you’re using, it’s default is set to 2.

sudo gedit /etc/pulse/daemon.conf

Near the bottom of the file, there will be a line which looks like this:

;default-sample-channels = 2

The semi-colon is a comment, so this line isn’t actually doing anything unless you remove that. I would suggest leaving that line alone and adding a new line at the bottom:

default-sample-channels = 6

If you’re using 5.1’s the number of channels will be 6, 7.1’s will be 8 and I think you get where I’m going with this? So in this example, I’m using 5.1’s.

Now save and close that file. You’ll need to reboot your system now too, so that these changes will take effect.

Step 2:

So you’re back? Good..

Now you’re going to want to open up the Sound Preferences, usually you can do this by clicking on the little sound icon in your panel, or System > Preference > Sounds from the menu.

From here, you’ll want to click on the Hardware tab. Near the bottom it’ll say Profile: with a drop down box next to it. Here you can select the type of set up you have, as you can see in the screenshot I have an “Analogue Surround 5.1 Output”, yours might be different and that’s cool and if you don’t know feel free to try a few out. Next to that drop down box is a button which says “Test Speakers”, this didn’t work for me so I have to use an online test but give it a try as it might work!

That’s it, you should be done!

Categories
Linux Posts Ubuntu

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

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!