Not able to resize and make a partition of my startup disk

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by TheBlueGod - 11/25/11 2:33 PM

Hi, I'm running Lion on a late - 2010 15 inch MBP and I already have a Boot Camp partition of Windows 7. I wanted to partition my hard drive again to install Ubuntu (which should be relatively painless). I tried out the live CD to get a taste of what it would be like, and actually tried partitioning from there, which did not work. So I booted back to OSX and went to Disk Utility, selected my drive and tried to resize my Macintosh HD partition to make space for a 4ish GB partition for Ubuntu. I hit Apply, but then I get this error:

<div>Partition failed with the error:<div>File system resize support required, such as HFS+ with Journaling enabled.

My Macintosh HD is of type Mac OS Extended (Journaled), and my Bootcamp is NTFS. I see EFI and Recovery HD partitions that I haven't seen before, but I understand they have always been there but were hidden. I tried repairing disk permissions, and it works for the Macintosh HD, but when I try for the entire drive I get this error, even though I clearly have an EFI system partition that I can see:

This disk doesn't contain an EFI system partition. If you want to start up your computer with this disk or include it in a RAID set, back up your data and partition this disk.

So what do I do so I can partition my disk successfully? I'm willing to backup and erase my harddrive completely to install Lion again, but I recently did that (well, a few months ago) when I felt that updating from Snow Leopard without a clean install was laggy. So I hope there's a way I can do this without doing a clean install again. Thanks a lot, and this is my first question so I hope I've provided enough info.
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