I think if Ubuntu Live only need 700 mb's then it should be able to be run from a USB.
You are here
Ubuntu on USB
April 26, 2008 - 4:08pm
#1
Ubuntu on USB
April 26, 2008 - 4:17pm
#2
Marty, Welcome
Marty, Welcome to PortableApps.com
Try this:
https://portableapps.com/search/node/Ubuntu+usb
for previous discussions on the subject.
Using other search criteria in the search box above (e.g. just "ubuntu" or "ubuntu flash" or "ubuntu portable" etc,) will yield even more results.
Tim
-