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Once your install's complete go ahead and boot to it from rEFInd.One note: I had trouble here as neither Debian nor Ubuntu could work the wireless card without the necessary drivers, so have an ethernet cord at the ready. Create a partition on the free space you made earlier, and sit back. (the easy part) Now just install Linux as you would on a PC.Once you have the necessary free space reboot with the install media inserted, and boot to it from rEFInd.As stated by tjt263 you can either use diskutil in the terminal or the Disk Utility app. Make some free space on the hard drive.If you're like me and don't like the default GUI it can easily be themed.
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First step is to install the boot manager rEFInd ( ).Note, I had an easier time installing Ubuntu over Debian, but it may have been due to a corrupt Debian image.
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