One boot loader must be on the root partition and another one on the MBR.If you choose to put Ubuntu's boot loader on the MBR it will recognize RHEL and you will see it in the boot menu when you turn on your pc.Don't know will RHEL do the same because I never used it,but if we're going to look the way Fedora handles this,then it want happen.You will had to do it manually by editing /boot/grub/menu.lst file in RHEL and adding an entry for Ubuntu.
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