Unsupported while loading boot.efi -- no matter what

[DaveQB]

Hi,

I have 1 SSD and Mac OS Mavericks and Ubuntu 14.04 on there now (upgraded them). Grub is on the disk bootloader (Still called MBR on GPT disks?)

Grub boots Ubuntu fine, but I can not get it to boot the Mac partition.

I have installed rEFInd to a USB thumbdrive. Booting off it detects both OSs. Selecting Ubuntu takes me to the grub menu and we boot find. Selecting to boot the Mac install, I get this error. "Unsupported while loading boot.efi"

http://i.imgur.com/6N1gXbm.png

I get this no matter which menu item I choose; all options are unsupported. It makes me feel there is another, underlying issue here. Maybe boot.efi is missing? I am not sure how to further troubleshoot this.

Any help appreciated.

[Roderick W. Smith]

If boot.efi were missing, it wouldn't show up in the menu. A more likely explanation is that your OS X partition is damaged and needs to be repaired. You can do this from Disk Utility -- although if you can't boot OS X, you'll need to use an installation or emergency disk to get into Disk Utility.

One more point: You haven't explicitly said that you're using a Mac. If this is a Hackintosh, rEFInd won't boot the OS X boot loader, since boot.efi uses a proprietary "fat binary" format that only Macs understand. If you're using a real Mac, though, this shouldn't be an issue.

[DaveQB]

Thanks Roderick.
I am using a Hackintosh, so that probably explains it. I didn't realise rEFInd wasn't for Hackintoshs.

Thanks.