Checking my logs, 6 March was the end of a long weekend when this bug occurred for me. So a large number of updates happened at once, including:
mesa 17.3.3-0ubuntu1 -> 18.0.0~rc4-1ubuntu3 mutter 3.26.2-1build1 -> 3.27.91-1 gnome-shell 3.26.2-0ubuntu3 -> 3.27.91-0ubuntu1 wayland 1.14.0-1 -> 1.14.0-2 gdm3 and xorg-server remained unchanged when the regression occurred, so at least we can exclude those. ** Changed in: xorg-server (Ubuntu) Status: Confirmed => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1753776 Title: Graphics corruption (or distortion?) in login animation to Xorg sessions To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1753776/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs