To disable the sending of listchanges information from APT run the following command:
dpkg-reconfigure apt-listchanges
Then select None
as Method to be used to display changes
. Confirm all other requests with the default selected value.
If enabled the debsecan-package will send a daily email with all vulnerabilities in installed packages on the system. To disable remove the MAILTO
from the file /etc/cron.d/debsecan
.