Originally Posted by chakraa
( Plzlist exactly what to add in /boot/grub/menu.lst of RHEL 5 if any )
Boot into RHEL and open a terminal, issue command: fdisk -l
to see which partition is which.
If RHEL /boot or root partition (RHEL usually makes a separate /boot partition...I think) is /dev/hda2 issue the four commands below as root to put you in a grub session, tell grub to use the RHEL configuration file, and install itself in the MBR of the first drive.
Make sure you use the right partition. If you make a mistake and things go whacky, boot with the Ubuntu live CD in a live session and try again.
Grub counts from 0, so hda2 becomes hd0,1 to grub.