It may be that the reason your shutdown stops there is because there are
unattended upgrades in progress at the time, and so it waits for them to
finish.

Your screenshot definitely shows two related bugs:

 - plymouth is failing to launch the splash screen for you.  This is a bug in 
plymouth (though I don't know what might be causing it).
 - unattended-upgrades is configured to report the status of any running 
upgrades via plymouth, but this *isn't* where the "checking" message is sent, 
that message is sent to the console.  Even though we want proper plymouth 
integration and we want the message to show on the splash at shutdown, 
unattended-upgrades should *also* send status to the console, for consistency 
there.

** Summary changed:

- Hang on shutdown
+ last message on the screen at shutdown is "Checking for running 
unattended-upgrades:"

** Package changed: upstart (Ubuntu) => unattended-upgrades (Ubuntu)

** Changed in: unattended-upgrades (Ubuntu)
   Importance: Undecided => Medium

** Changed in: unattended-upgrades (Ubuntu)
       Status: Confirmed => Triaged

** Also affects: plymouth (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: plymouth (Ubuntu)
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/803709

Title:
  last message on the screen at shutdown is "Checking for running
  unattended-upgrades:"

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