I would like to run ubuntu on my external hard drive. I have got virtual box installed in the external hard drive and made a machine named ubuntu and installed the latest ubuntu version which i got from the .iso download. Now after much juggling around i got ubuntu running on the machine which i did the whole installation. When i move it to another machine the virtual box just woudnt open. What is the reason for this and how can i get the ubuntu run from whichever machine i plug in the external usb hard disk. Thanks a lot for your answers in advance. Best regards Bhavan