Won't boot after installing Ubuntu 12.04 sucessfully

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http://askubuntu.com – I installed Ubuntu 12.04 successfully and rebooted (I took out my installation CD), and selected the newly installed Linux partition to boot from rEFIt. Then it just comes up with an error "Error loading operating system" which could not be more vague. Take that back. I guess it could say just "error." I don't even get to the boot prompt which limits what I can do. I cannot boot into rescue mode. I tried boot repair, but it took more than 24 hours to check the system configuration, so I gave up on that. I think a little more knowledge may be needed...so... I'm running a Mac Mini with its mai (HowTos)