Eu faço desse jeito:
## ## End Default Options ##
title Ubuntu, kernel 2.6.20-15-generic
root (hd0,2)
kernel /boot/vmlinuz-2.6.20-15-generic root=UUID=e7309010-2f99-4480-be04-4e92214bad5c ro quiet splash
initrd /boot/initrd.img-2.6.20-15-generic
quiet
savedefault
title Ubuntu, kernel 2.6.20-15-generic (recovery mode)
root (hd0,2)
kernel /boot/vmlinuz-2.6.20-15-generic root=UUID=e7309010-2f99-4480-be04-4e92214bad5c ro single
initrd /boot/initrd.img-2.6.20-15-generic
title Ubuntu, kernel 2.6.20-14-generic
root (hd0,2)
kernel /boot/vmlinuz-2.6.20-14-generic root=UUID=e7309010-2f99-4480-be04-4e92214bad5c ro quiet splash
initrd /boot/initrd.img-2.6.20-14-generic
quiet
savedefault
title Ubuntu, kernel 2.6.20-14-generic (recovery mode)
root (hd0,2)
kernel /boot/vmlinuz-2.6.20-14-generic root=UUID=e7309010-2f99-4480-be04-4e92214bad5c ro single
initrd /boot/initrd.img-2.6.20-14-generic
#title Ubuntu, kernel 2.6.20-13-generic
#root (hd0,2)
#kernel /boot/vmlinuz-2.6.20-13-generic root=UUID=e7309010-2f99-4480-be04-4e92214bad5c ro quiet splash
#initrd /boot/initrd.img-2.6.20-13-generic
#quiet
#savedefault
#title Ubuntu, kernel 2.6.20-13-generic (recovery mode)
#root (hd0,2)
#kernel /boot/vmlinuz-2.6.20-13-generic root=UUID=e7309010-2f99-4480-be04-4e92214bad5c ro single
#initrd /boot/initrd.img-2.6.20-13-generic
#title Ubuntu, kernel 2.6.20-12-generic
#root (hd0,2)
#kernel /boot/vmlinuz-2.6.20-12-generic root=UUID=e7309010-2f99-4480-be04-4e92214bad5c ro quiet splash
#initrd /boot/initrd.img-2.6.20-12-generic
#quiet
#savedefault
#title Ubuntu, kernel 2.6.20-12-generic (recovery mode)
#root (hd0,2)
#kernel /boot/vmlinuz-2.6.20-12-generic root=UUID=e7309010-2f99-4480-be04-4e92214bad5c ro single
#initrd /boot/initrd.img-2.6.20-12-generic
title Ubuntu, memtest86+
root (hd0,2)
kernel /boot/memtest86+.bin
quiet
### END DEBIAN AUTOMAGIC KERNELS LIST
# This is a divider, added to separate the menu items below from the Debian
# ones.
title Other operating systems:
root
# This entry automatically added by the Debian installer for a non-linux OS
# on /dev/hda1
title Microsoft Windows XP Professional
root (hd0,0)
savedefault
makeactive
chainloader +1