Under Ubuntu Breezy, I kept getting an error message fulfilling /var/log/messages whenever I was pressing any arrow keys :
Oct 30 10:50:27 pc1 kernel: [4323215.043000] atkbd.c: Unknown key pressed (translated set 2, code 0xaa on isa0060/serio0). Oct 30 10:50:27 pc1 kernel: [4323215.043000] atkbd.c: Use 'setkeycodes e02a keycode' to make it known.
Adding this line to /etc/sysctl.conf fixed the problem :
setkeycodes e02a 104
(104 is for page up key as far as I know)