I did not find a solution that repairs the issue, so I installed Ubuntu 16.04 LST freshly.
This morning I used the machine before work to book a train ticket and print is. After that I shut down the machine. 15 Minutes later I remembered that I forgot to lool up something and booted the machine again and cannot login anymore. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1636718 Title: Grapical login fails (independent from Display Manager) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-session/+bug/1636718/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs