We are closing this bug report as it lacks the information, described in
the previous comments, we need to investigate the problem further.
However, please reopen it if you can give us the missing information and
don't hesitate to submit bug reports in the future.
** Package changed: gdm (Ubuntu)
As hinted to by the error message, the output of the commands:
xprop -root | grep XKB
gconftool-2 -R /desktop/gnome/peripherals/keyboard/kbd
Might help with deciding further where the problem is. Attaching them to this
bug report could be useful.
Keyboard may be unconfigured. You try reconfigure