Ubuntu 26.04 Security & Hardening
Harden Ubuntu 26.04 LTS: WireGuard, UFW, OpenVPN, CrowdSec, Fail2ban, SSH keys, ClamAV, AppArmor, post-quantum SSH, Wazuh SIEM.
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Part 1 of 12
How To Install WireGuard VPN on Ubuntu 26.04 LTS
Every remote worker, every road-warrior laptop, every home-lab server that needs to reach the office safely ends up needing a VPN. The choice used to be…
11 min read·Apr 2026
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Part 2 of 12
How To Configure UFW Firewall on Ubuntu 26.04 LTS
A fresh Ubuntu 26.04 server accepts connections on every open port by default. That is fine on a private lab network, terrible on a public cloud…
14 min read·Apr 2026
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Part 3 of 12
How To Harden Ubuntu 26.04 LTS Server (Complete Security Guide)
A freshly installed Ubuntu 26.04 server is reasonable out of the box, but it is not hardened. Default SSH settings, no firewall rules, no intrusion monitoring,…
14 min read·Apr 2026
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Part 4 of 12
Install OpenVPN Server on Ubuntu 26.04, 24.04 & 22.04
You want a VPN that lives on your own box, terminates where you decide, and logs exactly what you tell it to log. An OpenVPN server…
19 min read·Apr 2026
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Part 5 of 12
Install CrowdSec on Ubuntu 26.04 (Fail2ban Alternative)
Fail2ban has been the default answer for “block brute-force attempts” on Linux servers for over a decade. It works, but it is a lonely tool. Every…
12 min read·Apr 2026
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Part 6 of 12
Install Fail2ban on Ubuntu 26.04 LTS
Every internet-facing Ubuntu server takes a constant beating from SSH brute force, WordPress login spray, and bot scanners. A default sshd_config with password auth will see…
12 min read·Apr 2026
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Part 7 of 12
How To Set Up SSH Key Authentication on Ubuntu 26.04 LTS
Passwords on SSH are a bad idea. Brute-force bots hammer port 22 around the clock, and even a strong password leaks the moment a keylogger touches…
13 min read·Apr 2026
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Part 8 of 12
How To Install ClamAV Antivirus on Ubuntu 26.04 LTS
ClamAV is the open source antivirus scanner most Linux shops reach for when they need signature-based malware detection on mail gateways, file shares, web upload pipelines,…
13 min read·Apr 2026
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Part 9 of 12
How To Configure AppArmor on Ubuntu 26.04 LTS
AppArmor has been Ubuntu’s default Mandatory Access Control layer for over a decade, and on Ubuntu 26.04 LTS it ships pre-enabled with 108 profiles confining everything…
13 min read·Apr 2026
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Part 10 of 12
Ubuntu 26.04 Post-Quantum SSH Hardening Guide (ML-KEM Kex)
A quantum computer powerful enough to break classical SSH key exchange does not exist yet. The problem is that nation-state adversaries do not need one today…
11 min read·Apr 2026
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Part 11 of 12
How To Install Wazuh SIEM on Ubuntu 26.04 LTS
Running a server without a SIEM in 2026 is a losing game. Logs scroll past, failed logins pile up, and the first time anyone notices a…
15 min read·Apr 2026
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Part 12 of 12
Install sudo-rs: Memory-Safe sudo for Linux
Every Linux system has sudo. It’s the single binary standing between your unprivileged user account and full root access, which makes it one of the most…
13 min read·Apr 2026