Please run ' apport-collect -p plymouth 1043518' from the affected system after 
booting the live cd without splash (do *not* boot with nomodeset).
I would also like to see plymouth debug output from this machine, but I realize 
that may be difficult to capture if the video is corrupted after boot. By any 
chance, does switching to vt1 give you uncorrupted video after boot, allowing 
you to copy files off?

Fwiw, the display here looks like a framebuffer that plymouth (and X) is
expecting to be set up as a linear framebuffer isn't. That's likely to
be a kernel or bootloader bug rather than a plymouth bug. (bearing in
mind that the live cd uses a different bootloader than the installed
system) It may be helpful to test writing the image to a usb stick and
check whether the behavior is the same.

** Changed in: plymouth (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1043518

Title:
  live cd is unusable due to video degradation with the splash boot
  option enabled

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