A few years, the Linux topguns said that 400 viruses had been written for Linux, not for malicious reasons, but to see if it were possible. Not only did they not replicate, but they needed to be installed on the computer manually.

The main reason viruses don't work in Linux is not that no one writes them. MS viruses write themselves into executables and DLL's. In Linux, assuming you are not logged in as root, permissions make it impossible for viruses, or the users themselves, to write anything to the executables.

The only real security problems for linux is direct attacks when connected to the Web. Be sure to install a firewall, especially if you go full-time live on the web. Go to shields-up to check your ports.