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Recently I installed Ubuntu on my Macbook Pro with Lion. I had trouble getting it to work with my hardware and repartitioned the drive to eliminate Ubuntu. Now when I boot my mac I get an error about grub not existing. The only way I can boot into Lion is by holding the option key, going to rEFIT and selecting Lion. How can I eliminate grub and rEFIT and restore the original Lion boot without reinstalling lion?

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up vote 1 down vote accepted

If you log into your Mac partition open Terminal and then type in:

sudo fdisk -u /dev/disk0

That should do the trick. Reference fdisk Manual Page. It should be noted that messing with the MBR can be dangerous and I would advise having a backup.

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