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?