If you want to know what is Forex Trading, you can try with AVAFX. The website is available at www.avafx.com. Although the application is for Win*, but you still can run it in Ubuntu with Wine. I’ve tried it and it run smoothly with Wine.
I will not explain how to register an account, here. It’s a standard web register. So, there is no difficulty at all. Before we start, I assume that you have an account in AVAFX (Online Trading Center) already. If not than you can try with ‘Free Practice Account’. It’s a 21-day free practice account. Just click ‘Register Now’ and follow all the instructions.
For the starter you will have US$ 100.000 practice account. When you ready for the real thing, you can begin trading with a minimum US$ 100.