Great question — answering as the UphillTech team:
A good guide is available in a recent Lifehacker article . It's for triple-booting, but you can scale it down to dual-boot Linux and OS X. Excerpt: We won't be using Boot Camp to partition our disk, mostly because we don't need to. Since we're triple-booting, it's easier to see it all at once, rather than let some tool do it for us (if you've already installed Windows using Boot Camp, though, that's fine—just ignore the Windows parts of this step). Open up Disk Utility, click on your main drive (the very top option in the sidebar) and head to the "Partition" tab. … Go through the rest of the [Ubuntu] installation until the last window, where it's ready to install and asks you to...
Full answer by fideli: https://superuser.stackexchange.com/a/146663 (CC BY-SA 2.5).
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