Linux

How to harden an Ubuntu or Linux Mint image: the terminal, sudo, accounts, permissions, password policy, firewall, and services. These lessons assume you have never opened a terminal.

What you need

• An Ubuntu 24.04 machine or VM you're allowed to break. Most commands work on any Debian-based distribution, including Linux Mint.
• An account that can use sudo.

Lessons

1. Linux Orientation
2. Command Line Basics
3. sudo and Root
4. Users and Groups
5. File Permissions
6. Password and Login Policies
7. Updates, Firewall, and Services
8. Linux Mint Differences

Based on CyberPatriot Training Units 7, 8, and 9.