I'm having some trouble booting Mac OS X from GNU GRUB 2.02.
I get an infinite purple screen when attempting.

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2 Answers
Adding something like
menuentry "OS X" { insmod hfsplus set root='(hd0,gpt3)' chainloader /System/Library/CoreServices/boot.efi }
to your grub config might help.
Note that you may need to change the partition number from "gpt3" to something else, such as "gpt2" or "gpt4". You want to identify the partition on which OS X is installed and use its partition number. To use this example, copy it to your /etc/grub.d/40_custom file in Linux and then type sudo grub-mkconfig -o /boot/grub/grub.cfg
I pasted most of this answer from here: Mac OS X won't boot from grub menu in Ubuntu Precise on Apple MBA(5,2)

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I believe I had the exact same problem you are using refind right? If not hold option when booting load on OS X go here: http://www.rodsbooks.com/refind/ Installing this will allow you to select os x or ubuntu at power on.
This is a workaround:
Using OS X
Simply click here: http://sourceforge.net/projects/refind/files/0.8.3/refind-bin-0.8.3.zip/download to download the rEFInd program/app
Unzip the file
Open a terminal and goto the location where you unzipped the file ie say you unzipped the file in the Downloads directory you would type
cd Downloads
, then type./install.sh
this will place the refind on your hard drive.Reboot and refind will give you the options to select how you want to boot.

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rEFInd is also installable by its PPA, according to these instructions: http://www.rodsbooks.com/refind/installing.html#ppa - @daniel including instructions in your post will help people looking at your question, as if the link stops working this answer would become useless. – Wilf Oct 12 '14 at 18:14
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From the OP, it seems like he's booting past grub to the Plymouth screen, but the splash is solid purple and the system hangs there. I don't think rEFInd will fix this. – amanthethy Oct 12 '14 at 19:18
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Well refind loads before grub. He will be able to choose os x prior to the grub screen. I never got OS X to load from the grub screen. – Daniel Oct 12 '14 at 19:20
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I misread, sorry. Didn't realize he was trying to boot into OS X from grub. – amanthethy Oct 12 '14 at 19:44