Howtoforge posted a guide about installing GRUB 2 on Ubuntu Linux 9.04
>> How To Install GRUB 2 On Ubuntu 9.04
This tutorial shows how you can upgrade your GRUB bootloader to GRUB 2 on Ubuntu 9.04. GRUB 2 has been rewritten from scratch to clean up everything for modularity and portability.
>> How To Install GRUB 2 On Ubuntu 9.04