libgl1-mesa-glx еще не настроен

Так как мои sudo apt-get upgrade сегодня у меня есть странные ошибки в конце каждой установки программного обеспечения с помощью apt-get, например:

    $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:
  libglu1-mesa
The following NEW packages will be installed:
  libglu1-mesa
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:
 libgl1-mesa-glx
 libglu1-mesa
E: Sub-process /usr/bin/dpkg returned an error code (1)

Кто-нибудь знает, как это исправить? Я попытался apt-get purge или apt-get install на «эти» пакеты назад, не помогло.