Hi meo
... So how do I run the script? ...
The commands patrikg lists in reply #10 create a configuration file called
/etc/X11/xorg.conf.d/se_keyboard.conf , not a script. The last 2 commands
he lists back up that file.
When Xorg starts, it reads the /etc/X11/xorg.conf.d/se_keyboard.conf file
and uses it to set up the keyboard.