Set up the installation of GRUB automatically. This command uses the
more flexible command install (see install) in the backend
and installs GRUB into the device install_device. If
image_device is specified, then find the GRUB images
(see Images) in the device image_device, otherwise use the
current root device, which can be set by the command
root. If install_device is a hard disk, then embed a
Stage 1.5 in the disk if possible.
The option --prefix specifies the directory under which GRUB
images are put. If it is not specified, GRUB automatically searches them
in /boot/grub and /grub.
The options --force-lba and --stage2 are just passed
to install if specified. See install, for more