Ubuntu unattended upgrades

# enable unattended upgrades
dpkg-reconfigure --priority=low unattended-upgrades

# edit unattended-upgrades config file
vim /etc/apt/apt.conf.d/50unattended-upgrades

Unattended-Upgrade::Automatic-Reboot "true";
Unattended-Upgrade::Automatic-Reboot-WithUsers "true";
Unattended-Upgrade::Automatic-Reboot-Time "02:00";

Unattended-Upgrade::Mail "";
Unattended-Upgrade::MailReport "always";

# test unattended-upgrade
unattended-upgrade -v -d --dry-run