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Grub error on Mb Air, dual boot F18+ Lion

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http://forums.fedoraforum.org – Hi all, I succesfully installed Fedora 18 (final) on my Macbook Air 4.2. My partitioning scheme includes an hfs+ partition on /dev/sda4, mounted at /boot/efi and an ext4 root partition / . I can boot into Fedora without any problem but if I try to boot in Mac Os X choosing "Mac Os X 64 bit on /dev/sda2" in the Grub menu I get the following error: Code: error: can't find command 'xnu_uuid' error: can't find command 'xnu_kernel64' error: can't find command 'xnu_kextdir' If I want to boot Lion I have to keep the Option key pressed at startup and then choose 'Macintosh (HowTos)