If you have already installed Ubuntu 12.04, then install GParted with sudo apt-get install gparted.

Launch it using Alt+F2, and typing gparted.

If you don't have root right, just type sudo gparted in terminal.

In order to expand the 63GB partition, you must have free space in front of or after it. So first you will have to use GParted to resize a partition above or below your 63GB partition. Refer the following figure:

When you click on resize, a window will open where you can easily drag and resize your partition. Once the free space is made available, resize your 63GB partition just like the above covering that free space.

Hope this works for you.