Disk Utility suggests that I repartition.

How I got to this point:

I did a complete, fresh install of Ubuntu 10.10 Maverick 64-bit on my 1.0TB hard disk accepting all the installer's defaults.

If I repartition, I guess I should re-install, right? (I have no data yet so that would not matter.)

My question is, I guess, how do I prevent 'ground-hog day'? I don't want this to happen again.