I've fixed it by not only downgrading nvidia-common to 1:0.2.91.4 but also ubuntu-drivers-common to 1:0.2.91.4. After that I've reinstalled the nvidia-331-updates and everything works again.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1371828 Title: After updating nvidia-common to 1:0.2.91.7, nvidia drivers are no longer in use To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-common/+bug/1371828/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
