Unattended Updates - Debian

To set up auto updates on Debian, do the following:

apt-get install unattended-upgrades apt-listchanges

Edit /etc/apt/apt.conf.d/50unattended-upgrades and uncomment the line:

Unattended-Upgrade::Mail "root";

Edit /etc/apt/apt.conf.d/20auto-upgrades, and add the following:

APT::Periodic::Update-Package-Lists "1";
APT::Periodic::Unattended-Upgrade "1";

Or run the following command as root:

dpkg-reconfigure -plow unattended-upgrades