Ok, ps does show a /usr/sbin/gdm3 process running in cosmic. The extra session that loginctl used to show is this one (shown from bionic):
29033 tty1 Ssl+ 0:00 /usr/lib/gdm3/gdm-wayland-session gnome- session --autostart /usr/share/gdm/greeter/autostart and this is no longer running on cosmic. Fwiw, the gdm3 service status on cosmic shows the following error: Oct 08 12:01:07 xps15-9560 gdm3[1425]: Child process -1688 was already dead. ** Summary changed: - gdm kills itself (on purpose) immediately after switching away from tty1 + gdm kills greeter session (on purpose) immediately after switching away from tty1 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1794638 Title: gdm kills greeter session (on purpose) immediately after switching away from tty1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1794638/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
