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)' }