Hi Alien
Sorry for the confusion.
It was my post about partitions.
I deleted it when I saw Xpod's post, his is probably the most straightforward way to install Ubuntu.
If you do let Ubuntu have all the remaining space, you can easily shrink it down later and make another partition to use for something else if you like. (using Partition Manager or Ubuntu's 'gParted' utility).
In my deleted post I said that Ubuntu would set up 2 partitions in that space. One for Ubuntu proper and one for Ubuntu swap. The swap partition does what the page file does in Windows. It's often set at 1.5 times RAM, but that value isn't critical.
