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5.1. Notifications
Configuring Unattended-Upgrade::Mail in /etc/apt/apt.conf.d/50unattended-upgrades will enable unattended-upgrades to email an administrator detailing any packages that need upgrading or have problems.
Another useful package is apticron. apticron will configure a cron job to email an administrator information about any packages on the system that have updates available, as well as a summary of changes in each package.
To install the apticron package, in a terminal enter:
sudo apt install apticron
Once the package is installed edit /etc/apticron/apticron.conf, to set the email address and other options:
EMAIL="[email protected]"