laptop can not shutdown, just hangs

[Brian Millett]

How do I debug shutdown failures?  It used to be easier (please no
systemd flames) tracing each process stopping, but I have not yet
grokked how to trace a shutdown to determine which process is hanging.

How do I debug it?

Thanks.
-- 
Brian Millett -
[ Sinclair (to Captain Pierce), "A Voice in the Wilderness II"]
"This isn't a backwater outpost or Bronze tech world where you can come
 in, bare your teeth and expect everyone to fall in line. This is a
 diplomatic station and your kind of heavy-handedness is just going to
 make our job harder. This kind of help we don't need."

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