[ubuntu] can't boot ubuntu from usb 2.0 flash drive

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http://ubuntuforums.org – I can boot with ubuntu live cd only if I press F6 and select "Nomodeset" option. Hence, I need to do the same thing with the flash drive, but when I press f6, I get no option of selecting "nomodeset" or any other option. Therefore, how do I select and enable "nomodeset" on the usb 2.0 flash drive? (Hardware)