I am following this bug as I had some similar oddities after upgrading from U.Gnome 15.04 to 15.10. During the install I elected to keep the existing copy of /etc/gdm/custom.conf because I had made changes to the "list users" section that I wanted to keep.
Today I decided to replace my existing copy with the dpkg-dist copy, and low and behold, using that conf got everything back to normal. Just commenting in case it helps others. -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gdm in Ubuntu. https://bugs.launchpad.net/bugs/1500673 Title: gdm unusable after upgrading to 15.10 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm/+bug/1500673/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs