problems with booting without usb support from bios

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http://askubuntu.com – I have installed xubuntu 12.04 in an 60 Gig usb 2.0 external HD. I have been using that rather than my desktop. Recently I found myself in a fairly remote part of a third world country, with a very unreliable internet connections, a few laptops -- none of which boots off a USB. I did not expect that; it made things very difficult for me because I rely a lot on what I have in the xubuntu in my HD. Upon my return I have been looking for a solution to the problem of booting my HD when there is no BIOS support for USBs. I ran into plop. I copied the plop boot manager to a CD but it did not recog (HowTos)