Comment 1 for bug 136621

As documented, grub-update will re-write everything between:

# Put static boot stanzas before and/or after AUTOMAGIC KERNEL LIST

### BEGIN AUTOMAGIC KERNELS LIST
## lines between the AUTOMAGIC KERNELS LIST markers will be modified
## by the debian update-grub script except for the default options below

and

### END DEBIAN AUTOMAGIC KERNELS LIST

Any boot menu entries you want to retain should be placed outside this block, at the end of the file.

Example:

## ## End Default Options ##

title Ubuntu, kernel 2.6.20-16-generic
root (hd0,4)
kernel /vmlinuz-2.6.20-16-generic root=UUID=f8f56c60-4507-47ff-beaf-bb87352f3128 ro vga=791 quiet splash
initrd /initrd.img-2.6.20-16-generic
quiet
savedefault

title Ubuntu, kernel 2.6.20-16-generic (recovery mode)
root (hd0,4)
kernel /vmlinuz-2.6.20-16-generic root=UUID=f8f56c60-4507-47ff-beaf-bb87352f3128 ro single
initrd /initrd.img-2.6.20-16-generic

title Ubuntu, kernel 2.6.20-15-generic-x32
root (hd0,4)
kernel /vmlinuz-2.6.20-15-generic-x32 root=UUID=f8f56c60-4507-47ff-beaf-bb87352f3128 ro vga=791 quiet splash
initrd /initrd.img-2.6.20-15-generic-x32
quiet
savedefault

title Ubuntu, kernel 2.6.20-15-generic-x32 (recovery mode)
root (hd0,4)
kernel /vmlinuz-2.6.20-15-generic-x32 root=UUID=f8f56c60-4507-47ff-beaf-bb87352f3128 ro single
initrd /initrd.img-2.6.20-15-generic-x32

title Ubuntu, memtest86+
root (hd0,4)
kernel /memtest86+.bin
quiet

### END DEBIAN AUTOMAGIC KERNELS LIST

title Ubuntu Gutsy Tribe-5, kernel 2.6.22-10-generic
root (hd0,4)
kernel /vmlinuz-2.6.22-10-generic root=UUID=9bab8491-9029-4c78-a6f4-cd953cd7d9b4 ro quiet splash
initrd /initrd.img-2.6.22-10-generic
quiet
savedefault

title Ubuntu Gutsy Tribe-5, kernel 2.6.22-10-generic (recovery mode)
root (hd0,4)
kernel /vmlinuz-2.6.22-10-generic root=UUID=9bab8491-9029-4c78-a6f4-cd953cd7d9b4 ro single
initrd /initrd.img-2.6.22-10-generic

# 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/sda1
title Sony Windows Recovery Tool
root (hd0,0)
savedefault
makeactive
chainloader +1

# This entry automatically added by the Debian installer for a non-linux OS
# on /dev/sda2
title Windows Vista Home Premium
root (hd0,1)
savedefault
makeactive
chainloader +1