That's a pretty weird bug. Could you give details on your video cards/drivers? Also enable gdm debugging by uncommenting the debug line in /etc/gdm3/custom.conf and reboot, try to log into a wayland session and then add your syslog?
** Changed in: gnome-desktop (Ubuntu) Importance: Undecided => High ** Changed in: gnome-desktop (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-desktop in Ubuntu. https://bugs.launchpad.net/bugs/1726192 Title: 17.10 Login To Wayland Fails Unless User Logs Into Unity First Status in gnome-desktop package in Ubuntu: Incomplete Bug description: After upgrading from 17.04 to 17.10, it's not possible to log into the default 'Ubuntu' session unless I log into Unity first. If I log into Unity, immediately log out, then log into Ubuntu, it logs in without issue. If I don't log into Unity first, the login attempt to Ubuntu briefly shows a black screen, then returns immediately to the login prompt. From suspend or hibernate, I can continue using the Wayland session without issue through poweroff. If I reboot or shutdown, the first login needs to be Unity, then I can log out and back to the Ubuntu session normally. Attached is some output from syslog showing gnome-session related errors. I'm not sure if they show the specific error, but they do appear at the time a first Ubuntu login is attempted. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-desktop/+bug/1726192/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp