sudo apt update && sudo apt upgrade
sudo reboot
sudo apt install unattended-upgrades apt-listchanges bsd-mailx
sudo dpkg-reconfigure -plow unattended-upgrades
Configure automatic updates, enter:sudo vi /etc/apt/apt.conf.d/50unattended-upgrades
Set up alert email ID:Unattended-Upgrade::Mail "root@hg-system.com";
Automatically reboot Ubuntu box WITHOUT CONFIRMATION for kernel updates:Unattended-Upgrade::Automatic-Reboot "true";
Finally edit the /etc/apt/listchanges.conf and set email ID:email_address=root@hg-system.com