I have installed Mavericks on my PC, now I want to install Ubuntu 14.04 but I'm not sure which file should I download: 64-bit or 64-bit mac.
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Macs can't boot multi-catalog CD images, that's why there's a separate 64-bit Mac ISO.
If you're running on an actual Mac made by Apple (not a Hackintosh), grab the 64-bit Mac version.