This bug is problably invalid. I run the following and found out thatmy version 9.0-0ubuntu1 came from nowhere:
brunojcm@brunojcm-desktop:~/gnome-shell$ sudo apt-cache policy libgl1-mesa-glx libgl1-mesa-glx: Installed: 9.0-0ubuntu1 Candidate: 9.0-0ubuntu1 Version table: *** 9.0-0ubuntu1 0 100 /var/lib/dpkg/status 8.0.4-0ubuntu0.5 0 500 http://mirror.globo.com/ubuntu/archive/ precise-updates/main amd64 Packages 500 http://mirror.globo.com/ubuntu/archive/ precise-security/main amd64 Packages 8.0.2-0ubuntu3 0 500 http://mirror.globo.com/ubuntu/archive/ precise/main amd64 Packages After running this everything seems ok: brunojcm@brunojcm-desktop:~/gnome-shell$ sudo apt-get --reinstall install libgl1-mesa-glx=8.0.4-0ubuntu0.5 libgl1-mesa-glx=8.0.4-0ubuntu0.5 libglapi-mesa=8.0.4-0ubuntu0.5 ia32-libs ia32-libs-multiarch libglapi-mesa:i386=8.0.4-0ubuntu0.5 libglu1-mesa:i386 libqt4-opengl:i386 libgl1-mesa-glx:i386=8.0.4-0ubuntu0.5 libgl1-mesa-glx:i386=8.0.4-0ubuntu0.5 Reading package lists... Done Building dependency tree Reading state information... Done The following packages will be DOWNGRADED: libgl1-mesa-glx libgl1-mesa-glx:i386 libglapi-mesa libglapi-mesa:i386 -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to mesa in Ubuntu. https://bugs.launchpad.net/bugs/1178517 Title: libgl1-mesa-dev unistallable (outdated dev package?) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mesa/+bug/1178517/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp