Ubuntu suddenly won't boot on a Mac

Posted by emchristiansen on Ask Ubuntu See other posts from Ask Ubuntu or by emchristiansen
Published on 2011-12-01T00:37:55Z Indexed on 2011/12/01 2:20 UTC
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Filed under:

boot

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grub2

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mac

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uefi

I installed 11.10 in dual-boot mode following instructions here:

https://help.ubuntu.com/community/MactelSupportTeam/AppleIntelInstallation

Everything worked fine, until I recently updated from Mac OS 10.6.x to the latest 10.6.x (this was a minor update prompted by OS X). The update made the rEFIt screen disappear, so I ran Boot Repair and reinstalled rEFIt and everything worked.

I accidentally left my computer without power while booted into Ubuntu, until it presumably died or hibernated itself. I have been unable to boot into Ubuntu since. I didn't see the GRUB screen when I selected Linux the rEFIt chooser. Then I reinstalled rEFIt and the Linux option disappeared from the rEFIt chooser.

This is a link to the boot info collected by Boot Repair:

http://paste.ubuntu.com/755543/

Any help would be appreciated, especially an explanation of what all these components are (EFI, MBR, GPT, GRUB), where they live on disk, how the system knows to find each component, and how they relate to each other.

Thanks!

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