I want to replace Android with Ubuntu for Androids on my new HP Slate 21. As far as I known none has ever tried it yet and I would appreciate if Ask Ubuntu would help out here. Would I need to unlock & root first my machine? (In which case I will need a second machine plugged to my Slate...) Or can I just insert the bootable usb with the distribution I need and go from there as in a normal non-optical drive situation? Also where can I find the downloadable file/image of Ubuntu for Android as describe here? I see no link with the name on it.. Should I just download the normal dis and choose from options when installing it?