In comment #5 it says "No proprietary drivers are in use". Please try changing the option in that dialog and back again, then click "Apply Changes".
After rebooting if the problem is not solved then please run 'apport- collect 1781125' to send us newer system information. ** Changed in: xorg-server (Ubuntu) Status: Invalid => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1781125 Title: Display drivers are not Avaialble To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1781125/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs