[ubuntu] Boot Loader failed to install

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http://ubuntuforums.org – I installed ubuntu 12.04 and after detecting my other operating systems GRUB failed to install. I was using the alternate installation disk to install a RAID1 as outlined here Thinking I could use the disk to detect other operating systems I installed it again onto a flash drive but the new OS didn't come up. So I'm without a way to boot into what should be my primary installation and I've never had to deal with something like this before. Help is appreciated. (Hardware)