But why the hell would you want to?

http://www.reghardware.co.uk/2007/12/07/eb_eee_pc_with_xp/

It’s just so damn wrong! You have an OS that’s fast, clean, small and efficient… and you go through the pain of the installation process to instal and OS that’s slow, dirty, takes up an inordinate amount of space and is just plain nasty… if you HAVE to kill off the custom linux instal Asus ships - at least plumb for Ubuntu.