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This tutorial shows how you can install and use F-PROT Antivirus on an Ubuntu Feisty Fawn desktop. Although there are not many Linux viruses out there, this can be useful if you often exchange files with Windows users - it can help you to not pass on any Windows viruses (that do not do any harm to Linux systems) to Windows users. F-PROT Antivirus for Linux is free for home use.

http://www.howtoforge.com/f_prot_antivirus_ubuntu_feisty