+C<device>, with the root directory being C<root>.
+
+Note: If grub-install reports the error
+\"No suitable drive was found in the generated device map.\"
+it may be that you need to create a C</boot/grub/device.map>
+file first that contains the mapping between grub device names
+and Linux device names. It is usually sufficient to create
+a file containing:
+
+ (hd0) /dev/vda
+
+replacing C</dev/vda> with the name of the installation device.");