So I've had a look at trying to start plymouth before lightdm has
shutdown, in order to start capturing console messages sooner.
Unfortunately this doesn't work right, lightdm shutting down puts the VT
into a state that lightdm isn't expecting so the splash doesn't update
the screen correctly.

I don't see a way to fix this reliably with the current architecture.
We could fix individual messages that are being output, but unless
there's some way to get the output redirected to plymouth before lightdm
stops, there's no way to ensure a completely text-free shutdown without
causing very problematic knock-on effects.

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https://bugs.launchpad.net/bugs/967229

Title:
  Text mode shown briefly with various "cryptic" texts when logging out
  or shutting down

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