And then run apt-config dump to verify the results.
In Hardy, take a look at this file:
/etc/apt/apt.conf.d/50unattended-upgradesI uncommented hardy-updates to allow those to be automatically applied as well. The unattended upgrade is performed by a python script:
/usr/bin/unattended-upgradewhich logs to
/var/log/unattended-upgrades/unattended-upgrades.logYou can run this script manually with -d to get it to write debug info to the log.