How to use install disk on a Mac?

I have a couple disks for Win7 and Ubuntu lying around I'd like to use on my Mac Mini 3,1 but I can't boot from them. I tried the holding down alt during startup and the disk didn't show up. Any and all help is appreciated.
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  1. Best answer
    To set up Windows on your Mac Mini, you need to install Boot Camp from within OS X first. Go here for help:

    Also, there are several guides for setting up Ubuntu on a Mac. Such as this one:
  2. Best answer selected by cakekindel.
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