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I own a MacBook Pro running Mountain Lion. I would like to dual-boot my Mac OS with Ubuntu. When I download the file and try to open it, it reads "No mountable file systems". I have downloaded both the 64 and 32 bit software. Can someone help me through this process?

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You need to set up the Mac so that there is a valid file system for Ubiquity to find and start installing to. Have a look at the Mac installation wiki and go from there as they have done a wonderful job already.

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I have been using this Installation Guide. I downloaded rEFIt and installed it but when I start up my computer I do not get to "boot choose on startup" so I'm thinking that my problem is with rEFIt. –  Garek Erskine Oct 8 '12 at 21:25
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Has to be an EFI boot, I installed x64 Ubuntu on my schools mac last year in highschool along side to the mac os, im pretty sure all i did was download the ISO and used Disk utility to put it on the flash drive, you can use Rufus https://github.com/pbatard/rufus/wiki/FAQ Fat32 EFI partition, good luck!

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