Ok, I did what Daniel van Vugt (vanvugt) suggested above: edit /etc/gdm3/custom.conf and uncomment the line:
#WaylandEnable=false Then I took the two package upgrades for gnome-shell-common and gnome-shell and the system booted successfully this time. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1831514 Title: Ubuntu 19.04 system update causes boot failure To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1831514/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs