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The help text of grub2 explains the detailed steps to create a disk image with grub2 installed on it. However, the steps for the BIOS-based systems have a few minor issues fixed by this patch: - When calling partx to get the partitions detected, we should do it on the /dev/loop0 block device, and not on the underlying disk.img image file. - The grub-bios-setup utility must be called as root to work properly on /dev/loop0. - The steps to cleanup the partx and loop device were missing. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>