I've experienced this sort of bug twice today on 16.04. I've submitted a new bug with logs at https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1578043
I've experienced this sort of bug twice today on 16.04. I've submitted a new bug with logs at https:/ /bugs.launchpad .net/ubuntu/ +source/ xorg/+bug/ 1578043