Adjusting Ubuntu resolution in VirtualBox

I had a problem when installing an Ubuntu 10.10 image in VirtualBox because the screen resolution was remaining at a tiny 800x600, barely allowing room for a single terminal window.

The following commands install the guest additions which are necessary for running Ubuntu at full resolution:

sudo apt-get update
sudo apt-get install build-essential linux-headers-$(uname -r)

sudo apt-get install virtualbox-ose-guest-X11

Thanks goes to Gilbert Galea for providing the above solution.