Ubuntu 12.04 / turning Numlock on at Login screen

*Version
Ubuntu 12.04

$sudo apt-get install numlockx
$sudo vi /etc/lightdm/lightdm.conf
add line

greeter-setup-script=/usr/bin/numlockx on

from
http://askubuntu.com/questions/155679/how-to-enable-numlock-at-boot-time-for-login-screen
2nd answer