>What is confusing however in the ps outputs attached is that in all three 
>process outputs:
> - plymouthd in boot mode is still running
> - /bin/plymouth quit has not completed

I experience the same issue. This also causex 'plymouth --ping' to hang
indefinitely. If I kill plymouthd manually reboot continues.

But it seems like this is a real corner case. I don't use the default "quiet 
splash" kernel commandline options. Instead I use "console=tty0 
console=ttyS1,115200n8" in order to have a serial console for SOL (serial over 
LAN). And I use a custom Upstart file to start an X server instance. The 
problem disappears if I either:
 a) remove the second console option from the kernel commandline  or
 b) delay start of the X server, for example by adding "started dbus and 
plymouth-ready" to the start conditions in my custom Xserver upstart config

$ apt-cache policy plymouth
plymouth:
  Installed: 0.8.8-0ubuntu17.1
  Candidate: 0.8.8-0ubuntu17.1

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https://bugs.launchpad.net/bugs/1316991

Title:
  Shutdown hangs waiting for plymouth-shutdown

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