"No space left on device" is coming up way too often in your log. I can't explain that but it is still possibly relevant since a lot of things are failing with that message.
Please monitor your disk usage carefully, before and after the problem occurs again. And when it occurs again, please send us a fresh log file as well as more 'df -h' output. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1755800 Title: Greeter/lockscreen fails to authenicate in an endless loop To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1755800/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs