Mac mini 6,1 Ubuntu Server

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http://askubuntu.com – I'm having some issues installing Ubuntu Server on my mac mini 6,1. It does boot on the USB stick, install run smoothly but then after I have a 'No Operating System Found' message when i try to boot. I've tried with & without EFI boot partition, setting it as bootable or not. I'm starting to be out of ideas to make it work. I'd like to install it as the only system. Thanks, (HowTos)