alternate installer pxe for ubuntu 8.04

if you don't have an usb cdrom or don't want to mess with the usb boot install
then you can install with pxe
seems that it works for me and is quite easy

https://wiki.koeln.ccc.de/index.php/Ubuntu_PXE_Install

ps: i borked my cloudbook with an gos -> hardy upgrade but i don't panic i will find a way to put a good os back (or parts of it :lxde/awn ...)