Hope everyone's having a blessed Good Friday!

A couple quick questions about antivirus. Do I really even need to worry about antivirus on Ubuntu CE?

If I do, what's the best solution to install/run and antivirus app? Command line or GUI? I've installed clamav through the command line before on Linux servers I've worked with.

Also, do I need to do any configuring to the firewall or just use it out of the box?

Thanks a bunch!