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I installed Ubuntu 12.04 on my new Mac Pro. I had some problems because bootcamp did not allow me to partition the hd without a Windows cd.

I inserted a Windows cd and did the partition and then I stopped the installation. I completed the installation of Ubuntu that now works.

The problem is that Grub can't start Mac OS. It sees the Mac OS X in the menu but if I try to start it I have a black screen or sometime just the boot manager.

Has anyone else experienced this problem?

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I had the same problem. [here's a link that might clarify things for you.][1] [1]: askubuntu.com/questions/162075/… –  MrIllwind Oct 17 '12 at 13:00

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