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[bug #41439] Grub menu for OSX doesn't boot due to ghost drive detected

From: Mike Donald
Subject: [bug #41439] Grub menu for OSX doesn't boot due to ghost drive detected
Date: Sun, 02 Feb 2014 18:42:59 +0000
User-agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:26.0) Gecko/20100101 Firefox/26.0


                 Summary: Grub menu for OSX doesn't boot due to ghost drive
                 Project: GNU GRUB
            Submitted by: quackers
            Submitted on: Sun 02 Feb 2014 18:42:58 GMT
                Category: Booting
                Severity: Major
                Priority: 5 - Normal
              Item Group: Software Error
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 2.00
         Reproducibility: Every Time
         Planned Release: None



I have a retina MacBook Pro (10,1) and have OSX Mavericks, Windows 8.1 and
Ubuntu 13-10 installed.
They are all EFI installations.
The grub menu appears and both Ubuntu and Windows boot from it.
OSX does not - it goes to a plain coloured screen and just sits there.
OSX will boot from the Apple boot menu.
Grub complains that the partition can't be found (hd0,gpt2).
>From the grub command line I have run ls and it shows hd0 with no partitions
and hd1 with my 6 partitions present.
My Mac has only one hard drive.
With some help from someone on grub-irc a standalone grub 2-02-git.efi was
chainloaded from grub and the output was this

ls -l
Device hd0: No known filesystem detected - Sector size 512B  Total size 1KiB

Device hd1 was reported as having my 6 gpt partitions present.

Grub appears to be viewing the first 2 sectors of my drive as a separate
As a consequence if I try to boot OSX manually I need to set root as hd1,gpt2
rather than hd0,gpt2.
It boots with the former address but not the latter.

This problem only manifests itself with OSX. Both Ubuntu and Windows will boot
from hd0 addresses.

Un petit problem, n'est ce pas?

This is my first grub bug report so I have no idea as to attachments. I will
attach anything requested but may need unstruction to do so.


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