Here is a solution that worked for me:
http://ubuntuforums.org/showpost.php?p=7275427&postcount=762
If you place this (fat binary) file on your FAT formatted USB stick to
/EFI/BOOT/BOOTX64.EFI
/EFI/BOOT/BOOTIA32.EFI
then when you insert the stick into an Intel Mac and press "Alt", an icon
called "EFI Boot" shows up and you can boot from this USB stick into GRUB2.
Place the following in /efi/boot/grub.cfg on your USB stick to boot
Ubuntu Live automatically:
# Timeout for menu
set timeout=0
# Set default boot entry as Entry 0
set default=0
# Entry 0 - Load Linux kernel
menuentry "Ubuntu Live" {
fakebios
search --set /casper/vmlinuz
linux /casper/vmlinuz boot=casper video=efifb agp=off show-cow noprompt --
debian-installer/language=de console-setup/layoutcode=de max_loop=32
initrd /casper/initrd.gz
boot
}
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Booting from USB fails on MacBook Pro 3,1
https://bugs.launchpad.net/bugs/202039
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