The issue came back for me a few shutdowns after I purged old kernel
images as explained above.

I was gonna wait until I've had more time before calling it successful
at least for me as a work around but I tried Adam's idea too and so far
it is working.  When you 'sudo swapoff -a' it takes time on my machine
for the system to do the switch.  I hear the cpu fan run higher and the
terminal screen is delayed in giving me the prompt back while the
command is processed.  I'm sure totally normal behavior.  Then I shut
down as usual and there is no delay at all, I see the message for a
second maybe and then my machine is off.

I first played around with the swappiness=0 but that made my machine
hang for normal operations so I set it to 50 and then tried Adam's idea
just before shutdown.  I think a nice script would be cool to make until
this issue is fixed officially.

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https://bugs.launchpad.net/bugs/1464917

Title:
  reboot hangs at 'Reached target Shutdown'

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