What are the best security programs for ubuntu?

[Tomatz]

If you have a physical firewall (router), you will not need to install firestarter. As a router/firewall does the same job but IMO better.

Go here to run tests to see how secure you really are:

http://www.grc.com/x/ne.dll?rh1dkyd2

I pass all tests with a cheap belkin router

[Tomatz]

I just ran a test on the first 1056 ports of my OS. As you can see, to a hacker they just wouldn't exsist.