it might, or you might just have your linux options listed. if that's the case, in a terminal type in
sudo update-grub
that will search your HDD for any installed OS, and add it to the list of options to boot from. After that, reboot and both options should be there in the main menu.
For instance, when i run it in a terminal, i get this:
sudo update-grub
Generating grub.cfg ...
Found Debian background: linuxmint.png
Found linux image: /boot/vmlinuz-2.6.35-22-generic
Found initrd image: /boot/initrd.img-2.6.35-22-generic
Found memtest86+ image: /boot/memtest86+.bin
Found Microsoft Windows XP Professional on /dev/sda1
Found BackTrack 4 R2 (4 R2) on /dev/sda3
Found Ubuntu 10.10 (10.10) on /dev/sda6
done
I have several OS'es
