If you ever decide to reinstall try xfce.
As @manuel was referring to, have you tried this fix yet.
Slow shutdown with systemd-247
If this hasn’t been tried, it would at least remove one more suspect.
It fixed my 2 minute shut down problems.
Pudge
Didn’t see this one. That might just do it.
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Does it say “watchdog failed to stop” when attempting to shutdown or reboot?
I’ve been having this exact issue. It’ll take about a minute and a half and then shut down, but right before it does shut down it says
watchdog: watchdog0: watchdog did not stop!
watchdog: watchdog0: watchdog did not stop!
sd-unmount[10821]: Failed to unmount /oldroot: Device or resource busy
sd-unmount[10822]: Failed to unmount /oldroot/sys: Device or resource busy
shutdown[1]:Failed to finalize file systems, ignoring.
any ideas on what could help?