Peculiar effect with keyboard -solved

[David Bowskill]

Hello All

Thanks to all who have replied on this curious problem, for which I have
found the cure on the internet.

The effect was that I could login on the GDM screen but when Xwindows
started, pressing any key would only produce an alert sound. This effect
suddenly appeared one day.

Postings on the Ubuntu Forum (from where I got the cure) showed a few
people have experienced this before.

The cure was; within Xwindows press Ctrl+Alt+F1 (worked within X despite
the 'alert').
Now in command line mode, run 'sudo aptitude install sandwich'.

I would appreciate if anyone could explain to me as to what 'sandwich'
is and how it works?

Many thanks
David Bowskill