Ubuntu Installation :: Installing 10.4 After 10.10 - Grub Does Not Pick It Up

I have 10.10 installed on my machine. I'm trying to install 10.4 on another partition. Install completes, but when I reboot, there's no entry in the grub menu for the 10.4 install. I tried adding an entry to 40_custom in /etc/grub.d, but it still doesn't show up. I'm pasting my 40_custom below.

#!/bin/sh
exec tail -n +3 $0
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the 'exec tail' line above.
menuentry 'Ubuntu 10.4' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod part_msdos
insmod ext2
set root='(hd0,msdos10)'
search --no-floppy --fs-uuid --set be888928-a477-4b31-b478-13271009c032
linux/boot/vmlinuz-2.6.32-24-generic root=UUID=be888928-a477-4b31-b478-13271009c032 ro quiet splash
initrd/boot/initrd.img-2.6.32-24-generic
}