How can I make Ubuntu run completely off of a flash drive? I have downloaded Ubuntu onto a 4gb flash drive but no changes I make are saved between sessions. I want to be able to run and save everything I do to the flash drive. I don't want it interfering with my hard drive at all. I just want to be able to plug my flash drive in the computer boot Ubuntu, and for it to save my changes. E.g. When I install Google Chrome, when I reboot it isn't there.