How to turn on Num Lock on GNOME startup?

Unofficial Ubuntu 5.04 Starter Guide: "

sudo apt-get install numlockx
sudo cp /etc/X11/gdm/Init/Default /etc/X11/gdm/Init/Default_backup
sudo gedit /etc/X11/gdm/Init/Default

4. Find this line

...
exit 0

5. Add the following lines above it

if [ -x /usr/bin/numlockx ]; then
/usr/bin/numlockx on
fi

6. Save the edited file (sample)
7. Read How to restart GNOME without rebooting computer?"