By default unattended upgrades are disabled. Meaning security updates will not be installed. It is a good idea to enable this, once a security update is released the system will automatically update the package to the new version. This keeps the systems more secure.
sudo apt install unattended-upgrades |
Afterwards enable it using the following command. When you get a pop-up box select "yes".
sudo dpkg-reconfigure -plow unattended-upgrades |