I have a working RHEL in /dev/sda1 and a newly constructed Ubuntu Lucid in /dev/sda2. I'm going to edit the grub config and reboot the server into the new Ubuntu. However, I'm not 100% sure that the new distro can boot. And since my only way to access the server is via SSH, I need the network to be up too.
How can I configure Grub and Ubuntu so that if the server fails to boot, it will automatically reboot into the old RHEL?
Currently using GRUB 0.93, but I can upgrade it if needed.
Update: In the end, no boot failure occured. But without the insurance from this, I wouldn't have attempted http://serverfault.com/questions/208128/how-to-remotely-install-linux-via-ssh =)