So what tool, or what options for journalctl, can I use to see what happened at the last shutdown.
UPDATE: I tried using
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journalctl --since=2017-04-05
UPDATE 2: If what I have read is correct, then journals are not kept from previous shutdowns unless I do some kind of setup. Not sure exactly what I need to do as the only reference I have found thus far, is related to CentOs (or some such). Not sure where to go from here. Some explicit instructions would be helpful (and telling me to go to H--- would not be helpful. LOL) .
UPDATE 3: Okay. Maybe this is what I need to do (from /usr/share/doc/systemd/README.Debian)
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install -d -g systemd-journal /var/log/journal
setfacl -R -nm g:adm:rx,d:g:adm:rx /var/log/journal
Once enabled, and I discover the problem, how do I turn off persistent logging?