I recently fixed a bug which prevented GDM from working (LP: #1686257) for people who had GDM installed but not Ubuntu GNOME. Could you give it a try and let us know if that fixes your issue?
** Changed in: gdm3 (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gdm3 in Ubuntu. https://bugs.launchpad.net/bugs/1680826 Title: [radeon duo] GDM shows but blank screen appears when trying to log in to GNOME To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-gnome/+bug/1680826/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs