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unattended-upgrade(8) System Manager's Manual unattended-upgrade(8)


unattended-upgrade - automatic installation of security (and other) upgrades


unattended-upgrade [options]


This program can download and install security upgrades automatically and unattended, taking care to only install packages from the configured APT source, and checking for dpkg prompts about configuration file changes. All output is logged to /var/log/unattended-upgrades/*.log.

This script is the backend for the APT::Periodic::Unattended-Upgrade option and designed to be run 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.log
Just simulate installing updates, do not actually do it


The configuration is done via the apt configuration mechanism. The default configuration file can be found at /etc/apt/apt.conf.d/50unattended-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.

May 4, 2009