[ubuntu] Trouble with efi-booting on mac

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http://ubuntuforums.org – Hi I'm trying to dualboot osx and ubuntu 12.10 on my macbook. I'm setting up efi-booting following this tutorial: http://www.rodsbooks.com/ubuntu-efi/index.html I'm up to point 26. Basicly I've installed everything but grub2. The sudo grub-install command doesn't work for me. The only thing I'm doing different than the tutorial is that I'm installing 12.10 instead of 12.04. When I type the grub-install command I get "Install device isn't specified" although I typed sudo mount /dev/sda1 /boot/efi If I try sudo grub-install /boot/efi I get "usr/sbin/grub-bios-setup: Not fo (Hardware)