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Since my sudo apt-get upgrade today I have this weird error(s) in the end of each software installation with apt-get, for instance :

    $apt-get -f install 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Correcting dependencies... Done
The following packages were automatically installed and are no longer required:
  liblzo2-2 uswsusp
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
The following NEW packages will be installed:
0 upgraded, 1 newly installed, 0 to remove and 10 not upgraded.
1 not fully installed or removed.
Need to get 0 B/165 kB of archives.
After this operation, 561 kB of additional disk space will be used.
Do you want to continue [Y/n]? Y
Selecting previously deselected package libglu1-mesa.
(Reading database ... 140491 files and directories currently installed.)
Unpacking libglu1-mesa (from .../libglu1-mesa_7.10.2-0ubuntu2.1_amd64.deb) ...
Setting up libgl1-mesa-glx (7.10.2-0ubuntu2.1) ...
update-alternatives: error: alternative link /usr/lib/xorg/extra-modules is already managed by x86_64-linux-gnu_gl_conf.
dpkg: error processing libgl1-mesa-glx (--configure):
 subprocess installed post-installation script returned error exit status 2
dpkg: dependency problems prevent configuration of libglu1-mesa:
 libglu1-mesa depends on libgl1-mesa-glx | libgl1; however:
  Package libgl1-mesa-glx is not configured yet.
  Package libgl1 is not installed.
  Package libgl1-mesa-glx which provides libgl1 is not configured yet.
dpkg: error processing libglu1-mesa (--configure):
 dependency problems - leaving unconfigured
No apport report written because the error message indicates its a followup error from a previous failure.
                          Errors were encountered while processing:
E: Sub-process /usr/bin/dpkg returned an error code (1)

Does anyone know how to repair that ? I have tried apt-get purge or apt-get install on 'these' packages back did not help.

share|improve this question

The error is caused by this line:

update-alternatives: error: alternative link /usr/lib/xorg/extra-modules is already managed by x86_64-linux-gnu_gl_conf.

In this case, it's harmless to force configuration of libgl1-mesa-glx and solve your problems.


sudo dpkg --force-all --configure libgl1-mesa-glx

Followed by:

sudo dpkg --configure -a

And then (just in case):

sudo apt-get -f install

To force-install that specific libgl1-mesa-glx from scratch, please do:

sudo dpkg --force-all -i libgl1-mesa-glx_7.10.2-0ubuntu2.1_amd64.deb
share|improve this answer
Thanks for the answer: After that I receive : – Patryk Jul 11 '12 at 21:25
@lordmonkey: please try sudo dpkg-reconfigure --force libgl1-mesa-glx instead. Are you logged in as root? I noticed you're not using sudo... – izx Jul 11 '12 at 21:32
:/ – Patryk Jul 11 '12 at 21:41
@lordmonkey: please see edit at bottom of answer to try force-installing from scratch. – izx Jul 11 '12 at 21:53
which line do you mean exactly ? I have tried sudo apt-get -f instal but it didn't do the trick. – Patryk Jul 11 '12 at 22:00
up vote 0 down vote accepted

Ok, I have finally fixed it with uninstalling nvidia-common

sudo apt-get purge nvidia-common

and reintalling the drivers with Additional drivers GUI

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