Cannot boot new base Ubuntu Server 13.04 installation on Mac Mini 6, 1

[Jason Heeris]

The 13.04 server install image seems to get *really close* to what the
Apple bootloader needs, except for the HFS+ formatted boot partition
containing whatever magic files it expects. I suspect the installer is
designed to work with rEFIt/rEFInd and nothing else.

I wonder if maybe I could move the files off /dev/sda1 (what gets
mounted at /boot/efi), reformat it as HFS+ and put them back along
with whatever else is needed.

— Jason