Installing 12.04 on USB

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http://askubuntu.com – I have a samsung series 9 notebook. It only has 128 gb of ssd storage, and I want to be able to use Ubuntu 12.04 on it. Can I install Ubuntu onto a usb? Not to use it for installing onto my computer, but to natively run on it and act like hard drive. The USB is 32gb and if it can be done, how would I go about doing it? Cheers. (HowTos)