This instructable with walk you though getting a virtual keyboard working with the current release (11.04) of Ubuntu.
There are other ways of doing this (which I've done in the past), but trying to reaccomplish the task, I found many shortcuts to what I did in the command line previously.
If you have any questions on the command line or getting around in Ubuntu, please see my previous instructable. In this instructable I will assume you have a basic knowledge of the system and how it works. Like my last instructable terminal commands will be given starting with $. Do not copy the $ when transposing.
Also, don't transpose anything to terminal between [ ], it's there for reference.