Dual booting with Ubuntu9.1 & Fedora12. Happy with Fedora but running into some problems getting ATI Radeon 3100 to work properly(+no sound).
Did a dual boot before with both running, but previously ubuntu identified fedora and edited grub menu accordingly. This time not so lucky. Ubuntu updated to grub 2 and right when you cat the file the first line is "DO NOT EDIT THIS FILE"

Mainly looking for suggestions, How to's, things to watch out for...

below are some of the current grub file
-----Ubuntu---
}
menuentry "Ubuntu, Linux 2.6.31-16-generic (recovery mode)" {
recordfail=1
if [ -n ${have_grubenv} ]; then save_env recordfail; fi
insmod ext2
set root=(hd0,6)
search --no-floppy --fs-uuid --set f9646e99-29b6-4d3b-8ab4-3d02d7599309
linux /boot/vmlinuz-2.6.31-16-generic root=UUID=f9646e99-29b6-4d3b-8ab4-3d02d7599309 ro single
initrd /boot/initrd.img-2.6.31-16-generic
}
menuentry "Ubuntu, Linux 2.6.31-14-generic" {
recordfail=1
if [ -n ${have_grubenv} ]; then save_env recordfail; fi
set quiet=1
insmod ext2
set root=(hd0,6)
search --no-floppy --fs-uuid --set f9646e99-29b6-4d3b-8ab4-3d02d7599309
linux /boot/vmlinuz-2.6.31-14-generic root=UUID=f9646e99-29b6-4d3b-8ab4-3d02d7599309 ro quiet splash
initrd /boot/initrd.img-2.6.31-14-generic
}
menuentry "Ubuntu, Linux 2.6.31-14-generic (recovery mode)" {
recordfail=1
if [ -n ${have_grubenv} ]; then save_env recordfail; fi
insmod ext2
set root=(hd0,6)
search --no-floppy --fs-uuid --set f9646e99-29b6-4d3b-8ab4-3d02d7599309
linux /boot/vmlinuz-2.6.31-14-generic root=UUID=f9646e99-29b6-4d3b-8ab4-3d02d7599309 ro single
initrd /boot/initrd.img-2.6.31-14-generic
}
-----------Fedora----
#boot=/dev/sda
default=0
timeout=0
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title Fedora (2.6.31.9-174.fc12.x86_64)
root (hd0,0)
kernel /vmlinuz-2.6.31.9-174.fc12.x86_64 ro root=UUID=60c162e8-fa56-4c46-ac0f-d82f6a13dbf0 rhgb quiet SYSFONT=latarcyrheb-sun16 LANG=en_US.UTF-8 KEYTABLE=us
initrd /initramfs-2.6.31.9-174.fc12.x86_64.img

Hi and welcome to LinuxQuestions,

Have a look at these sites, I've found them very helpful.

GRUB2 Basics
GRUB2 Full Tutorial

Kind regards,

Eric

That file lists other files it is updated from. Go to those.