This issue is NOT getting Ubuntu to run on a Mac.
The issue is how to install Ubuntu, so that you can image it with Deploy Studio and install it on many more Macs. For those who are Windows users, Deploy Studio is sorta like a free version of Windows Ghost, but for the Macintosh. Schools often use it to quickly image 100s or even 1000s of Macs over a network.
For anyone reading this later, Deploy Studio works quite well with OS-X on Macs. It seems to work adequately with Windows partitions on Macs.
They provide some information about setting up a Triple Boot Mac.
And they say that one should:
Install the system on the first partition, the GRUB bootloader at the begining of this partition (not in the MBR) and use a swap file instead of a dedicated partition,
And they have another one that says:
Triple boot configurations require the Linux boot loader (GRUB or LILO) to be installed at be beginning of the related partition.
Since I'm a newbee to Ubuntu and Linux, I'm trying to figure out how to follow their advice. I tried ignoring it and that didn't work all that well either.
Again, I'm a newbee, but I think the deal is, that if the GRUB bootloader isn't part of the Linux partition, then it doesn't get copied up to the Deploy Studio Server and it doesn't then get copied to the new machine.