apt install unattended-upgrades
dpkg-reconfigure unattended-upgrades
echo 'APT::Periodic::Unattended-Upgrade-Time "3";' >> /etc/apt/apt.conf.d/20auto-upgrades
echo 'APT::Periodic::RandomSleep "3600";' >> /etc/apt/apt.conf.d/20auto-upgrades
sed -i 's|^//Unattended-Upgrade::MailReport "on-change";$|Unattended-Upgrade::MailReport "on-change";|' /etc/apt/apt.conf.d/50unattended-upgrades
sed -i "s|^//Unattended-Upgrade::Mail \"\";$|Unattended-Upgrade::Mail \"root@$(hostname -f)\";|" /etc/apt/apt.conf.d/50unattended-upgrades