This actually started with the last systemd drop, but it's still
happening with today's systemd drop.
The boot proceeds and then stalls on tty1 with:
[^[[1;32m OK ^[[0m] Started LSB: ProFTPD FTP server.
[^[[1;32m OK ^[[0m] Started LSB: Starts the postfix daemons.
[^[[1;32m OK ^[[0m] Started LSB: Video Disk Recorder.
[^[[1;31mFAILED^[[0m] Failed to start Wait for Plymouth Boot Screen to Quit.
See 'systemctl status plymouth-quit-wait.service' for details.
[^[[1;32m OK ^[[0m] Reached target Multi-User.
[^[[1;32m OK ^[[0m] Reached target Graphical Interface.
The DM (GDM) does not start. However, if you ALT-F2 to tty2, getty
comes up, and if you do "service dm start", the DM starts, oddly enough,
on tty1.
So, apparently, GDM can clear tty1 and start normally if it actually
gets control, but whatever systemd is doing to start the DM either isn't
getting done or is failing prematurely.
