I have seen the same behavior you describe on my ubuntu 10.04, whenever
I forgot to activate Num Lock key. It is quite annoying, but you can use
Home key (if I remember it correctly) to return back to plymouth boot
screen.

What I think is a lot worse is that there seem to be no way I know of (without 
recompiling your own kernel; numlockx or setleds and similar solutions are 
useless if you need Num Lock enabled during cryptsetup) to force Linux to 
respect BIOS setting saying Num Lock should be enabled on boot. For details see:
http://lkml.indiana.edu/hypermail/linux/kernel/0702.1/2363.html
http://lkml.indiana.edu/hypermail/linux/kernel/0707.1/1834.html
etc. (search the web for more:)

I would even try to compile my own kernel, but it would probably mean
recompiling it for each security patch again, which I consider way too
much effort compared to just pushing one more key during each bootup.
Still I think some widely used distro like Ubuntu or Linux Mint could
perhaps provide modified kernel solving this endless Num Lock problem,
because if Windows can why not Linux?

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https://bugs.launchpad.net/bugs/692170

Title:
  numlock weirdness when typing passphrase

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