Kernel 4.15.0.39.41 working fine. Last upgrade have broken xserver- common. Reinstalling solves the issue.
As suggested in xdiagnose, I disabled vasedf for precaution. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1795256 Title: frequent crash of Ubuntu 18.04 with purple dotted screen or black screen error death To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795256/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs