To secure Ubuntu, keep the release and its packages supported, install security updates, use a standard account for daily work, limit exposed services, and keep AppArmor enabled. Add controls that fit the system’s role: a desktop, an internet-facing server, and a private development machine do not have the same exposure or access needs. Ubuntu describes a fresh installation as generally safe for immediate use, but its general security introduction is not a comprehensive hardening guide, and no short checklist guarantees security.
How do I secure Ubuntu?
Start with a layered baseline, then adapt it to the release, installed software, network exposure, and people or services that need access. Canonical’s security suggestions cover updates, least privilege, software selection, and remote access. The Ubuntu Server security introduction notes that Ubuntu’s customization options prevent a general introduction from serving as a complete hardening guide.
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- Check support for the actual release and packages. Confirm the release lifecycle and the repository components your system uses; coverage is not identical for every package.
- Install updates consistently. Use regular package maintenance and decide whether automatic updates suit the workload and its change-control needs.
- Use least privilege. Do routine work from a non-root account and use
sudofor administrative tasks. - Reduce unnecessary software and exposure. Remove packages and services the system does not need, and be deliberate about adding third-party repositories.
- Configure network access. Use a host firewall where appropriate and permit only the services required. On remote systems, preserve management access before tightening rules.
- Keep AppArmor enabled. Its per-application policies add a layer of confinement; investigate a policy issue rather than disabling the framework as a general fix.
- Secure remote administration. Apply SSH best practices and consider a VPN when an encrypted private connection fits the network design.
These measures reduce common risks but do not replace system-specific decisions such as backup and recovery planning, monitoring, application configuration, or access reviews.
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Canonical recommends regular package maintenance with sudo apt update && sudo apt upgrade. The first command refreshes package information; the second installs available upgrades. Ubuntu also recommends unattended-upgrades for automated security updates.
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Canonical says unattended-upgrades is included by default in Ubuntu Desktop and Server installations starting with Ubuntu 18.04 LTS, with security updates installed automatically. Do not assume that a particular machine’s configuration, update cadence, or reboot behavior matches that default: check the installation’s settings and operational requirements.
- Automatic updates can reduce the chance that security fixes are missed, but administrators should account for compatibility, maintenance windows, and workload-specific change control.
- Manually scheduled updates provide more control over when changes land, but require a reliable process for checking and applying them.
Kernel and other updates can require a reboot. Canonical’s security suggestions describe Livepatch as a way to apply eligible kernel patches while a system is running, potentially reducing the need for an immediate reboot. Livepatch does not replace the full update process or eliminate reboot planning.
How long does Ubuntu LTS get security updates?
Support depends on the release, repository component, and any Ubuntu Pro services in use. Canonical’s security updates table lists five years of standard maintenance for LTS Main and Restricted packages, and nine months for interim releases. Those periods should not be treated as universal coverage for every package on a system.
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Ubuntu is a fixed-release distribution, and security fixes are generally delivered as backported patches. Check the lifecycle for your specific release and the component containing each package rather than assuming all installed software has the same maintenance window.
Moving to a newer release is different from installing routine package updates. Canonical recommends LTS releases for their longer standard support window and documents sequential LTS upgrade paths. Before a major release change, follow the upgrade instructions for the current release in Canonical’s Ubuntu release upgrade guide.
What does Ubuntu Pro add for security?
Ubuntu Pro may be relevant if a host needs additional maintenance coverage, Livepatch, or compliance-related features. Canonical’s Ubuntu security page describes up to 15 years of vulnerability fixes across stated operating-system, infrastructure, and applications coverage. That is not a blanket promise that every package, repository, release, and configuration receives identical coverage for 15 years.
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The applicable period depends on the release, repository, and service combination. Canonical’s security updates documentation distinguishes standard LTS maintenance from Ubuntu Pro offerings, including Expanded Security Maintenance (ESM) and ESM Legacy. Check the current eligibility and package coverage for the exact host before relying on an extended maintenance period. Livepatch can address eligible kernel patches while the system runs; it does not replace package updates or the broader maintenance process.
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Ubuntu’s ufw firewall configuration tool is initially disabled, according to Canonical’s firewall documentation. Enabling it is a deliberate configuration step. The following commands illustrate basic rule management:
sudo ufw statusdisplays the firewall’s status and rules.sudo ufw allow 22allows traffic on port 22, commonly used for SSH. Use the port and protocol your service actually requires.sudo ufw deny 22denies traffic on port 22; this can block SSH access if that is how you manage the machine.sudo ufw enableactivates the firewall using its configured rules.
For a remote server, confirm the intended SSH or other management path is allowed before enabling restrictive rules, or you may lock yourself out. Allow only needed services, and check application profiles where available. The exact rules depend on the applications and network role; do not copy a port list without verifying what the host needs.
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Canonical describes ufw as suitable for many common cases. Direct management with iptables or nft can support more granular rules, but requires understanding the selected ruleset and which tool manages active firewall policy. Avoid casually combining firewall managers.
What is AppArmor, and should I disable it?
AppArmor confines applications through profiles that restrict the files, permissions, and other capabilities available to a process. Canonical says it is installed and loaded by default. In complain (learning) mode, a profile logs violations while permitting them; in enforce mode, it applies the policy.
Do not disable AppArmor as a routine troubleshooting step. Canonical’s AppArmor documentation warns: “Disabling AppArmor reduces the security of your system!” If an application is blocked, inspect the relevant profile and logs and determine whether the policy should be adjusted. Details vary by Ubuntu release; the server how-to describes changes to kernel integration beginning with Ubuntu 24.04 LTS.
How should I secure SSH and choose a VPN?
Remote access should match the host’s role and the people or systems that administer it. Follow Ubuntu’s SSH security suggestions, keep access limited to authorized users, and ensure firewall rules preserve the management route you intend to use.
A VPN can provide an encrypted private connection when that suits the access design. Ubuntu’s security suggestions name WireGuard and OpenVPN as options, but do not establish one best choice for every deployment. Choose based on client compatibility, administration needs, and the complexity and performance requirements of the network; there is no universal port or VPN configuration that fits every Ubuntu system.
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