automatic installation of security (and other) up‐ grades


unattended-upgrade [options]


This program can download and install security upgrades automatically and unattended, taking care to only install packages from the config‐ ured APT source, and checking for dpkg prompts about configuration file changes. All operations are logged to /var/log/unattended-up‐ grades/unattended-upgrades.log and the package manager (dpkg) output is logged to /var/log/unattended-upgrades/unattended-upgrades-dpkg.log This script is the backend for the APT::Periodic::Unattended-Upgrade option and designed to be run periodically by APT's systemd service (apt-daily-upgrade.service) or from cron (e.g. via /etc/cron.daily/apt).


unattended-upgrade accepts the following options: -h, --help help output -d, --debug extra debug output into /var/log/unattended-upgrades/unattended- upgrades.log --apt-debug detailed APT/LibAPT output for debugging -v, --verbose show verbose output --dry-run Just simulate installing updates, do not actually do it --minimal-upgrade-steps perform upgrade in minimal steps (cancel with SIGINT). This is the default now. --no-minimal-upgrade-steps do not perform upgrade in minimal steps


The configuration is done via the apt configuration mechanism. The de‐ fault configuration file can be found at /etc/apt/apt.conf.d/50unat‐ tended-upgrades


unattended-upgrade is written by Michael Vogt This manual page was originally written by Michael Vogt


Copyright (C) 2005-2009 Canonical There is NO warranty. You may redistribute this software under the terms of the GNU General Public License. For more information about these matters, see the files named COPYING. March 1, 2019 unattended-upgrade(8)

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