Comment 59 for bug 289918

I still had this bug on 13.04 with FreeNX ppa package connecting to the 13.04 server from a 12.04 client. The only solution (no specific setkbmap or xmodmap line worked [even matching what I got in 'xev' !], I could not find evdev in keyboard options [despite it in kernel and xorg.conf.d], and no gconf/dconf unset worked either) that succeeded for me was

on client:
xmodmap -pke > localxmodmap

(transfer localxmodmap to server)

on server:
xmodmap localxmodmap

I post on this "resolved" bug (many forums list 12.10 users struggling) only to help others. Solution was found here:
http://askubuntu.com/questions/123867/keyboard-map-is-incorrect-when-using-an-nx-client