Installing/Cloning from Ubuntu Installed and Running on USB to HD

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http://askubuntu.com – I installed Ubuntu on to a USB and everything's running perfectly thus far. I can use it to boot into my desktop as well as laptops. The question I have:- I would like to use the Ubuntu on the USB to install/clone Ubuntu on to one or more laptops. I'd also like to have the same software as on my USB installed on the other systems. Any changes I have to make to individual system installations, I'll take care of later. What's the best/easiest way of copying/cloning/installing a live system from a USB to the hard drive on multiple machines? TIA Sam (HowTos)