Securing Ubuntu — ufw firewall, AppArmor and automatic updates

45 min Ubuntu 24.04 Versions 20.04, 22.04, 24.04

Objective

Set up the three basic protections of an Ubuntu server exposed to the Internet: a firewall that lets through only what is needed, AppArmor, which confines each service to what it is allowed to do, and security fixes applied automatically.

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