Operating Systems/Linux/Ubuntu/Ubuntu 16.04 LTS

Checklist

• User and Password Management: /etc/passwd, /etc/group, /etc/shadow
• Pluggable Authentication Modules (PAM)
• Tunable Kernel Parameters (Sysctl)
• Package Managers (APT/DNF)
• CRON
• Permissions
• Systemd
• Sudo (/etc/sudoers file)
• Polkit
• Change Insecure Passwords
• Enable Firewall Protection (ufw or gufw)
• Disable/Remove Unauthorized Services
• Enable Daily Checks for Updates
• Install Security Updates
• Enable Pop-Up Blocker
• Remove Prohibited Files
• Remove Prohibited Software (Games, Hacking)

Categories

• User Account Management
• Firewalls
• Services
• Updates
• Bad Passwords
• Prohibited Stuffs
• Program Settings
• Security Policy
• Malware/Backdoors

**Note to editors: add new stuff to Ubuntu 22.04 LTS