Empirically is seems that gdm 2.26 is appearing on whichever monitor contains the mouse pointer, which in my case at bootup seems to be one pixel right of centre, putting it just onto my secondary monitor. I assume gdm 2.20 tried to pick the primary monitor.
-- gdm 2.26 appears on wrong monitor https://bugs.launchpad.net/bugs/395314 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs