Ubuntu 9.10 ships with the new GRUB (Grand Unified Boot Loader 1.97 beta) in plain words its the software that boots the operating system you choose when you boot the computer. In earlier versions of Ubuntu / Grub to change the menu on the grub screen, one had to edit the /boot/grub/menu.lst file. In the new system this a little different from just editing the one file.

The GRUB configuration now resides at /boot/grub/menu.cfg But do not edit this file as it is generated from files from /etc/grub.d/* and /etc/default/grub.