http://www.gnu.org/software/grub/

GRUB is the bootloader of the GNU system, and it's currently the only one that supports the multiboot standard, necessary to boot the Hurd.

• update-grub is Debian specific and very useful. It will automatically create a /boot/grub/grub.cfg file for the kernels in /boot/ and for OSes that it finds on various partitions, including GNU/Hurd.

• Make sure that GRUB 2's version is at least 20091130 and GNU Mach's version is at least 20091020.

• Sample file:

  menuentry "GNU/Linux" {
      insmod ext2
      set root=(hd0,12)
      linux      /boot/vmlinuz-2.6.32 root=/dev/hda12 ro
      initrd     /boot/initrd.img-2.6.32
  }
  
  
  menuentry "GNU" {
      insmod ext2
      set root=(hd0,16)
      multiboot /boot/gnumach.gz root=device:hd0s16
      module /hurd/ext2fs.static ext2fs --readonly \
              --multiboot-command-line='${kernel-command-line}' \
              --host-priv-port='${host-port}' \
              --device-master-port='${device-port}' \
              --exec-server-task='${exec-task}' -T typed '${root}' \
              '$(task-create)' '$(task-resume)'
      module /lib/ld.so.1 exec /hurd/exec '$(exec-task=task-create)'
  }