clamav
1. Install ClamAV, the daemon, and freshclam.
$ sudo apt-get install clamav clamav-daemon clamav-freshclam
2. Just as it finishes installing it will of course warn you that the virus database is older than 7 days and that it will need updating.
$ sudo freshclam
3. You may notice that it will bark at you because the ClamAV installation is outdated. As of the time that I am writing this, ClamAV has released a new version however it has not yet been tested and released to the Ubuntu public. Please see this for more information. http://www.clamav.net/support/faq
