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grub: Installing GRUB using grub-install

 
 4.1 Installing GRUB using grub-install
 ======================================
 
 For information on where GRUB should be installed on PC BIOS platforms,
 ⇒BIOS installation.
 
    In order to install GRUB under a UNIX-like OS (such as GNU), invoke
 the program 'grub-install' (⇒Invoking grub-install) as the
 superuser ("root").
 
    The usage is basically very simple.  You only need to specify one
 argument to the program, namely, where to install the boot loader.  The
 argument has to be either a device file (like '/dev/hda').  For example,
 under Linux the following will install GRUB into the MBR of the first
 IDE disk:
 
      # grub-install /dev/sda
 
    Likewise, under GNU/Hurd, this has the same effect:
 
      # grub-install /dev/hd0
 
    But all the above examples assume that GRUB should put images under
 the '/boot' directory.  If you want GRUB to put images under a directory
 other than '/boot', you need to specify the option '--boot-directory'.
 The typical usage is that you create a GRUB boot floppy with a
 filesystem.  Here is an example:
 
      # mke2fs /dev/fd0
      # mount -t ext2 /dev/fd0 /mnt
      # mkdir /mnt/boot
      # grub-install --boot-directory=/mnt/boot /dev/fd0
      # umount /mnt
 
    Some BIOSes have a bug of exposing the first partition of a USB drive
 as a floppy instead of exposing the USB drive as a hard disk (they call
 it "USB-FDD" boot).  In such cases, you need to install like this:
 
      # losetup /dev/loop0 /dev/sdb1
      # mount /dev/loop0 /mnt/usb
      # grub-install --boot-directory=/mnt/usb/bugbios --force --allow-floppy /dev/loop0
 
    This install doesn't conflict with standard install as long as they
 are in separate directories.
 
    On EFI systems for fixed disk install you have to mount EFI System
 Partition.  If you mount it at '/boot/efi' then you don't need any
 special arguments:
 
      # grub-install
 
    Otherwise you need to specify where your EFI System partition is
 mounted:
 
      # grub-install --efi-directory=/mnt/efi
 
    For removable installs you have to use '--removable' and specify both
 '--boot-directory' and '--efi-directory':
 
      # grub-install --efi-directory=/mnt/usb --boot-directory=/mnt/usb/boot --removable
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