I switched it back to root:root without suid and it works for me now. I added 
the following line to /bin/plymouth-greeter:
subprocess.call(["/bin/plymouth","message", "--text", "unattended-upgrades were 
here"])
It used to work for me in X11 Plymouth renderer if I started Plymouth daemon as 
root and passed messages to it, also as root, but it didn't work on shutdown. I 
chowned it to daemon and added suid bit, and the messages appeared on shutdown 
too. I switched permissions back and it still works... I'm totally confused 
with all those Upstart and Plymouth permissions now.

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https://bugs.launchpad.net/bugs/677516

Title:
  No sign of updates still being installed when shutting down

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