[ubuntu] grub help

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http://ubuntuforums.org – I am trying to get ubuntu to boot from USB from an intel mac with efi loader, traditionally not possible. By adding a recomiled grub2 into /efi/boot/bootx64.efi I can now get it to happily load up any iso that I leave in that folder named boot.iso. This is great, but I can't get it to have perseverence in iso form. If I rename the iso and drop a grub.cfg in there the grub in the bootx64.efi reads and displays it, so I can't see any reason why I can't now install ubuntu onto the drive using unetbootin (set with perseverance ) than alter than grub config to boot my linux image - but I'm ha (Hardware)