: Non-root user attempting update. Fix : Run with sudo (Linux) or as Administrator (Windows). Nessus writes to protected directories.
To download the secure plugin archive, you must authenticate your scanner ownership using two unique strings. Extracting the Challenge Code download nessus-update-plugins all-2.0.tar.gz
Historically, the nessus-update-plugins script used tools like lynx to retrieve the archive from http://www.nessus.org/nasl/all-2.0.tar.gz over (not HTTPS). Importantly, "The scripts are not signed so a cracker may poison your DNS server and force this script to retrieve scripts on another web server". : Non-root user attempting update