Trying to install 12.04 on my brother's Dell Studio 1535 laptop with Windows 7 Ultimate already on it. After I tell the BIOS to boot USB, it tells me
error: no such device: 51d55cfe-ca94-40b7-8d22-180e1a1f9762 grub rescue>
and I can type in stuff. I used the same USB 5 minutes earlier to install 12.04 on my IBM Lenovo Z61m perfectly. So the USB is flashed right.