Ubuntu security and remote admin guides
Secure Ubuntu with remote access, firewall tools, admin users, service hardening, and distro-specific maintenance guides.
Curated guides
Ubuntu security and remote admin guides
12 matched guides, best match first.
How to Install OpenSSH on Ubuntu 26.04, 24.04 and 22.04
Remote administration on Ubuntu is much safer once OpenSSH is installed, listening, and protected before you need emergency access. To install SSH server on Ubuntu, use the openssh-server...
How to Install UFW on Ubuntu 26.04, 24.04 and 22.04
Ubuntu ships UFW in its default repositories, but it often stays disabled until you need to lock down SSH, open a web port, or fix a ufw: command...
How to Enable or Disable Apparmor on Ubuntu 26.04, 24.04 and 22.04
AppArmor is enabled by default on Ubuntu because it adds mandatory access control on top of normal Linux file permissions. Most systems should keep that protection active, but...
How to Install SELinux on Ubuntu 26.04, 24.04 and 22.04
Some compliance baselines and RHEL-aligned workflows expect SELinux labels, booleans, and AVC audit logs instead of Ubuntu's default AppArmor profiles. You can install SELinux on Ubuntu 26.04, 24.04,...
How to Configure Unattended Upgrades on Ubuntu 26.04, 24.04 and 22.04
Automatic patching matters most on the systems you do not babysit every day. If you need to configure unattended upgrades on Ubuntu, the built-in unattended-upgrades package can install...
How to Add a New User to Sudoers on Ubuntu 26.04, 24.04 and 22.04
Ubuntu keeps routine administration tied to sudo instead of an always-enabled root account, which makes delegated access easier to audit and easier to revoke. If you need to...
How to Enable SSH on Ubuntu 26.04, 24.04 and 22.04
To enable SSH on Ubuntu Linux, confirm the OpenSSH server package is present, start the packaged SSH listener, allow the port through any active firewall, and test a...
How to Install Fail2Ban on Ubuntu 26.04, 24.04 and 22.04
Fail2Ban watches your service logs, catches brute-force attacks and other suspicious patterns, and bans offending IPs automatically by updating firewall rules. You can install Fail2Ban on Ubuntu with...
How to Install ClamAV on Ubuntu 26.04, 24.04 and 22.04
Servers that accept untrusted uploads, mail attachments, or shared files need a way to catch malware before it reaches users on other systems. ClamAV fills that role on...
How to Enable or Disable Firewall on Ubuntu 26.04, 24.04 and 22.04
If you need to disable the firewall on Ubuntu, UFW is usually the command you are looking for. You can confirm whether the firewall is active, turn it...
How to Install Chkrootkit on Ubuntu 26.04, 24.04 and 22.04
Rootkit checks are most useful when they run before a suspicious system becomes your only source of truth. To install Chkrootkit on Ubuntu, start with the package in...
How to Enable BBR on Ubuntu 26.04, 24.04 and 22.04
Enable BBR on Ubuntu when long-distance transfers, VPS traffic, or high-latency links feel slower than the available bandwidth should allow. BBR, short for Bottleneck Bandwidth and Round-trip propagation...