Install AVG Free Anti-Virus For Linux ~ Web Upd8: Ubuntu / Linux blog Using AVG Free Anti-Virus for Linux. After installing the packages for your Linux distribution, open a terminal and: -to start AVG, type the following command: sudo avgctl --start. -to update the virus definitions: sudo avgupdate. -scanning is very simple, just use "sudo avgscan ". For example, to scan your home directory: