[SLUG] howto rerun Ubuntu/Debian keyboard detect program?

[Sonia Hamilton <sonia@xxxxxxxxxxxx>]

When setting up Ubuntu/Debian in 'advanced' mode, a screen comes up that
detects your keyboard by asking you to type in a series of characters.

How would I get that program to run again on a machine that's already
installed? I've swapped a (hardware) keyboard on a machine to a
different language layout, and I want the labels on the keys to map to
what is actually entered.

-- 
Sonia Hamilton
blog: http://SoniaHamilton.wordpress.com