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I have osx and windows 8 installed using bootcamp and they are running fine.

I installed ubuntu 13 on external thunderbolt drive, it installed fine, however i am not sure what is the best way to triple boot.

I installed grub on mbr on external thunderbolt drive, so in theory if i install rEFTit, i should be able to choose either osx,windows, or ubuntu to boot?

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Yes. You are right.

rEFTit will let you choose what to boot, including the ubuntu.

Also, not many people know this, but fsck tends to break journaled file systems after alot of usage (not sure how this applies to SSD's).

So, you did a good thing not installing the *nix based operating system on the same drive as the mac.

Here is one worry I have. Im not sure if a reEFIit knows how to read (boot) a thunderbolt drive.

Here is my setup:

2013 Air 512 GB SSD split into 3 partitions rEFIT has replace Apples original EFI.

sda1 -> Mac OSX (Never boot into unless for firmware update)
sda2 -> Windows (Almost never boot into it unless doing something for work)
sda3 -> sda3a sda3b sda3c
sda3a -> Linux Mint
sda3b -> Arch Linux
sda3c -> gentoo. 

rEFIt gives me the first 3 options. Then I use grub to choose my flavor.

Hoe this helped.

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Success. All i need to do is to install rEFInd, and configure a boot entry for ubuntu using my ubuntu's GUID.

just follow the following

http://linuxmacbookproretina.blogspot.com.au/2012/12/ubuntu-1304-daily-build-macbook-pro.html

I can now boot ubuntu 13.04 installed on external thunderbolt drive.

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