So the "sddm not enabled" issue is a but in sddm, and the "root partition missing from /etc/fstab" was a local problem. Hence I think this can be closed.
** This bug is no longer a duplicate of bug 1432171 [udev] Shows "starting version 219" boot message even with "quiet" ** Changed in: systemd (Ubuntu) Status: Confirmed => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1431743 Title: fails to boot due to read-ony file system To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1431743/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs