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I am using an HP Probook 4540s which currently has Ubuntu 12.10 on it. I hit escape to go to which drive to boot from, and when i manage to choose the usb I get something like "Insane primary partition (mbr) I cant find myself from what you are trying to boot from. boot:" Where do I go from here?

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Try using dd to send the iso image to usb drive

sudo dd if=/path/to/iso/image of=/dev/sdb bs=8M

Is so important that add the bs=8M to make it work! And check that /dev/sdb is the device where you have the usb flash drive do it with

df -h
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