I do not remember pressing Esc, but it cannot be ruled out.

The other day I upgraded an identical server from hardy to lucid, while
watching it over the serial console, and saw no sign of the text-mode
splash screen, just regular fsck messages.  This

I haven't tested for 8-bit cleanliness, but I do not think that is a
problem.  I think the problem is with ubuntu-text being unable to
determine the size of the terminal.  Try this in a gnome-terminal:

  $ echo -e '\033[1;1fHi'

you will see 'Hi' in the top-left corner.   Now try

  $ echo -e '\033[-1;-1fHi'

and you'll see the U+001b missing font glyph, overlapping a [, followed
by -1;-1fHi -- exactly what I saw over the serial console.

If ubuntu-text wants to position the text in the middle of the screen,
but it gets the coordinates wrong somehow, that would explain
everything, wouldn't it?

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https://bugs.launchpad.net/bugs/915735

Title:
  plymouth: broken output on serial console (screen full of
  [-1;-1fUbuntu 10.04)

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