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Automatic security updates on Ubuntu Server

Configure unattended-upgrades so security patches install automatically without manual intervention -- reduces the window a known vulnerability stays unpatched on a server nobody logs into daily.

Système : Ubuntu 22.04 LTS / 24.04 LTSSecurityMaintenanceSite officiel ↗Documentation officielle ↗
Ce guide est élaboré à partir de la documentation officielle de Automatic security updates on Ubuntu Server, dont le lien figure ci-dessus — vérifiez toujours les noms exacts des paquets/versions avant d'exécuter ces commandes sur un serveur de production, car les versions de la distribution et du projet évoluent avec le temps.

  1. 1Install unattended-upgrades

    sudo apt update
    sudo apt install unattended-upgrades apt-listchanges

  2. 2Enable it

    Choose "Yes" on the prompt -- this enables the daily systemd timer that applies updates.

    sudo dpkg-reconfigure --priority=low unattended-upgrades

  3. 3Review what gets auto-updated

    cat /etc/apt/apt.conf.d/50unattended-upgrades

    By default only the -security repository is included. Uncomment additional origins in this file only if you specifically want full unattended upgrades, not just security patches.

  4. 4Verify it's actually running

    sudo unattended-upgrade --dry-run --debug