Ok, the key bit of the log is this:

[./plugin.c]                                  query_device:Visual was
FB_VISUAL_PSEUDOCOLOR, trying to find usable mode.

[./plugin.c]                                  query_device:Visual is
FB_VISUAL_PSEUDOCOLOR; not using graphics

This means your kernel is only presenting a 16-bit framebuffer for use,
not a 32-bit framebuffer; plymouth doesn't support properly displaying
on a 16-bit fb, so avoids using the fb at all to not present you with
horrible wrong color palettes.

If this worked for you in lucid with a full-color splash screen, then
there seems to be a bug in the nouveau kernel driver for no longer
exposing the expected 32-bit framebuffer.  Reassigning to the kernel.

If this can't be fixed in the kernel, we should blacklist this card in
grub-gfxpayload-lists.

** Package changed: plymouth (Ubuntu) => linux (Ubuntu)

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

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https://bugs.launchpad.net/bugs/1048261

Title:
  Blank screen during system startup with Precise/Nouveau

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