Upgrade
Upgrading External Packages with unattended-upgrade
The unattended-upgrade tool is a great way to keep your system automatically updated. Learn how it works and how configure it.
How to solve Shellshock on Debian and Ubuntu
Also Debian and Ubuntu are vulnerable for Shellshock vulnerability in Bash. That's why it is important to run apt update and perform an upgrade of Bash.
How to update Lynis
Tips and suggestions to keep Lynis up-to-date. With every software tool receiving improvements and bug fixes, it's important to update Lynis as well.