Both my XP host and my Ubuntu guest are 32-bit. (As already noted,
keyboard doesn't work at login or in KDE, but works in Gnome is you use
the on-screen keyboard to log in.)
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keyboard input broken at gnome login prompt after package updates
https://bugs.launchpad.net/bugs/548891
You received
I have the same problem here (Host: Windows XP, Guest, Ubuntu 10.04
beta, updated to latest as of 4/2/10). The keyboard doesn't work at all
at the login screen, but the mouse works fine. I can access the on-
screen keyboard to log in. If I log into KDE, the keyboard still
doesn't work at all.