One great advantage of using Linux (Ubuntu) is the fact that you don't really have to worry about security and hence viruses. However, this does not mean that you should not use an anti-virus on your Ubuntu machine. Especially when you can get a good anit-virus for free. BitDefender for Unices is one such anti-virus solution for Linux and you can get it for free. Let's see how to get a free license of BitDefender anti-virus for your Ubuntu machine and how to install it on your Ubuntu machine.