This is what helped me: https://answers.launchpad.net/ubuntu/+question/104757
-- 2.6.31-20-generic fails to boot https://bugs.launchpad.net/bugs/545973 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs