Workaround to install USB images in kvm/qemu (and perhaps others)
Ubuntu Mobile and Ubuntu MID images are provided as .img files aimed at
USB sticks. They also boot fine in kvm/qemu/vbox etc. with "-hda
blah.img", but if you try to install on a second hard disk, grub will
be installed on the first hard disk (containing your image); this wont
boot and will corrupt your downloaded .img.
Because grub installs on the first hard disk, you would think you can
setup the .img as the second hard disk and install on the first disk,
but this isn't possible because the BIOS used in qemu/KVM, bochs,
doesn't allow booting on the second hard disk.
As a workaround, we provide a small (< 400 kB) ISO image from which you
can boot on the second hard disk.