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We installed Ubuntu 12.04 and updated to 12.10 (Raring Ringtail) on a separate partition of our Mac tower. However, when trying to load Mac OS X from Grub, we get an immediate kernel error along the lines of "invalid kernel," which states that no Mac OS version has yet been set. Ubuntu itself works flawlessly, and we can see that all the data on the Mac OS partition is perfectly fine. What is the likely issue, and how can it be fixed?

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marked as duplicate by Chan-Ho Suh, Kevin Bowen, Thomas W., Eric Carvalho, Basharat Sialvi May 30 '13 at 3:59

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

try refind, a of fork of refit, boot manager for efi-based machine.

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