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


       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

       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


       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            unattended-upgrade(8)