I can reliably reproduce in an up-to-date artful VM. In my default session, GDMSESSION=ubuntu. If I then uncomment WaylandEnable=false in /etc/gdm3/custom.conf and reboot, the session selected by default is gnome-xorg instead of being ubuntu-xorg.
I can reliably reproduce in an up-to-date artful VM. In my default session, GDMSESSION=ubuntu. If I then uncomment WaylandEnable=false in /etc/gdm3/ custom. conf and reboot, the session selected by default is gnome-xorg instead of being ubuntu-xorg.