[Sussex] Putting systems onto a SD card

[gerry]

Hi
Sorry for the dual posting but I am not sure if the Sussex Lug site is 
running at the moment
However the problem is how do I get Ubuntu or any other Linux system to 
run from an SD card? I know Desmond has done it but when I try following 
various sets of instruction I get things like 'No Kernel' or just a 
flashing cursor. Inside Ubuntu there is a 'Create a USB start up  disk' 
but this is for installing a system on a machine not running it from the 
USB or SD. Help

Gerry