apt install cron-apt
All of the configuration files for cron-apt are located in the directory “/etc/cron-apt/” and the default crontab entry is located at “/etc/cron.d/cron-apt.” To change the frequency in which cron-apt checks for updates you will need to edit the crontab entry.
To configure cron-apt to send e-mail notifications, open the file “/etc/cron-apt/config” and adjust the following variables.
# Configuration for cron-apt. For further information about the possible
# configuration settings see /usr/share/doc/cron-apt/README.gz.
MAILON="always"
MAILTO="[email protected]"