Comment 6 for bug 684292

I haven't been able to reproduce this with a current precise daily in my tests in a hacked-up virtual machine: I gave it two disks, /dev/sda and /dev/sdb, installed a stunt version of udevadm that substitutes ID_BUS=usb for any ID_BUS= line, and told the installer to automatically partition the whole of /dev/sdb. It correctly installed the boot loader to /dev/sdb, and the resulting system boots when given only /dev/sdb as a disk.