Indeed a broken unit shouldn't fail the boot or shutdown unless it marks
itself as being required for booting. Can you please attach the said
unit, so that I can reproduce this?

It seems your system has some worse problems too:

Apr 26 13:02:29 hostname systemd[1]: Failed to activate swap 
/dev/mapper/root-swap.
Apr 26 13:02:36 hostname kernel: usb 1-13: device descriptor read/64, error -110
Apr 26 13:02:39 hostname systemd[1]: Failed to start Light Display Manager.
Apr 26 13:02:56 hostname libvirtd[2008]: Interner Fehler: Untergeordneter 
Prozess (/usr/sbin/dmidecode -q -t 0,1,4,17) unerwartet Ende Status 1: 
/dev/mem: No such file or directory

All of these are strange and seem to indicate kernel/hardware problems
(message 2 and 4), perhaps a broken fstab (message 1), etc.

Also, there's not only Ctrl+Alt+Del, you can also use "poweroff" or shut
down from the menus. Please don't just pull the plug; if nothing else
helps, "sudo poweroff -f" is still a lot better than that..

** Changed in: systemd (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1448656

Title:
  systemd doesn't allow proper shutdown after it encountered errornous
  .service

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