When I first got my MacBook Pro, I installed Windows 7 via Boot Camp.
A couple months later I wanted to install Ubuntu and have a triple boot. I followed this tutorial: triple-boot
After I finished following the steps in the tutorial, Windows would not boot (everything else worked fine), so I opened up Disk Utility and decided to remove the Windows partition (because it was setup with Boot Camp). Doing this only created a huge free space where my Windows partition used to be.
Now anything I try to do in Disk Utility displays the error:
"Mediakit reports no such partition", even when trying to split up my Mac HD.
How to fix this?