[ubuntu] OS X boot loader overwritten when installing Ubuntu?

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http://ubuntuforums.org – Hello I have an iMac with OS X 10.6.8. I created a roughtly-100GB partition on my 1TB internal hard drive to install Linux to. I downloaded Ubuntu 12.04 (version for 64bit intel-mac) and burnt the ISO on a CD Disc Utility. The installation from CD worked fine, Ubuntu loads up nicely. Except that, during installation I had some difficulty getting past the stage of setting up the linux boot loader. I can't remember the details, but on 'automatic' mode the installer kept halting at this boot loader step. So going 'manual' was my next option. In short, from what (Hardware)