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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.

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Just to make it clear, you aren't running Live-USB session but installation from USB? –  danijelc Nov 14 '13 at 13:14
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1 Answer

The easiest way to do this is to install Ubuntu on the flash drive with dedicated storage. If you use UNetbootin to create your flash drive you can specify how much space you want to allocate to the persistent storage. In the image below I allocated 2GB to it as an example.

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If you want to use the flash drive to run Ubuntu I would recommend allocating all the free space to on the disk to it. The obvious advantage being you will have more room to install your favorite applications.

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I feel dumb. when i installed it i didnt allow any memory for saves.... duhh so sorry –  user81217 Aug 4 '12 at 6:35
    
no worries. Please accept my answer then so this will not keep showing up in Unanswered questions. Btw, welcome to askubuntu! :) –  Aras Aug 4 '12 at 6:55
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