Linux Hint published a tutorial on Debian unattended-upgrades.

Manage Debian unattended-upgrades

An important task of a system administrator is to update the servers and apply security patches regularly. If an administrator forgets it, it can lead to extreme security threats. Linux systems enable you to install updates and security patches automatically using the unattended-upgrades utility. In this article, how to manage unattended-upgrades for automatically installing the updates and security patches are explained.

Manage Debian unattended-upgrades – Linux Hint