I encounter this highly annoying message and 90 second shutdown delay too often.
Why does TDM object to cmdline shutdown or reboot commands from login on the
vttys? How can it be stopped? The immediate inducement to write this comes from
Buster, but it happens in Stretch and openSUSE too, both in UEFI and legacy
contexts.
-- 
"Wisdom is supreme; therefore get wisdom. Whatever else you
get, get wisdom." Proverbs 4:7 (New Living Translation)

 Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata  ***  http://fm.no-ip.com/