[ubuntu] Run Ubuntu from USB drive on Windows laptop

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http://ubuntuforums.org – Here's what I want to accomplish, hopefully someone can give me a step by step: I have a Windows laptop that I want to run Ubuntu on. The computer is used for business during the day, but I want it to run as a 'netbook' type of machine in the evenings. Requirement 1: I want to be able to put in the usb key, reboot, and have it load Ubuntu instead of Windows. Requirement 2: I do not need access to the main machine hard drive, but I would like access to the remaining space on the USB drive. (In trying to do this in the past, the Ubuntu image loaded on an 8GB thumbdrive, but the unused p (Hardware)