Turns out this was pretty easy to get going on my Macbook 2006 model to install Xubuntu.

On my fedora computer I installed isomaster (yum install isomaster), then opened the Xubuntu.iso I downloaded with isomaster.

glaw@fedora ~ $ isomaster xubuntu-14.04-desktop-amd64.iso 

Highlight the EFI folder, ad then click the icon 5th icon on the bottom (I think its supposed to be a trashcan.

Then file -> Save As and save a new copy of the ISO. 

You will end up with a slightly smaller iso:

glaw@fedora ~ $ ls -la x.iso xubuntu-14.04-desktop-amd64.iso 
-rw——- 1 glaw users 953790464 Jun  4 20:22 x.iso
-rw-r–r– 1 glaw users 957349888 May  6 10:21 xubuntu-14.04-desktop-amd64.iso

Now burn the x.iso with your favorite burner. 

glaw@fedora ~ $ basero x.iso

Once your have burned this off successfully, insert into your Macbook, boot up while pressing the alt/option key and select the “Windows” Icon (the mac thinks this is a boot camp install).

This other website will help in getting your Mac setup for the new OS : 

http://www.rodsbooks.com/ubuntu-efi/