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I followed these instructions for installing Ubuntu Dual-Boot with OSX Lion, but when I finished and restarted it said "Missing Operating System". I restarted a few more times and I got the same message. Do I need to install 12.10 in a different way? At least I didn't mess up the OSX partition.

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Please see… –  Elder Geek Jun 25 '14 at 15:21
You might need to re-install grub boot loader on there. –  ryekayo Jun 25 '14 at 15:27

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