unattended-upgrade - automatic installation of security (and other) upgrades

To simulate installing updates, do not actually do it $ sudo unattended-upgrade --dry-run

To print debug messages $ sudo unattended-upgrade -d

To make apt/libapt print verbose debug messages $ sudo unattended-upgrade --apt-debug -v

To print info messages $ sudo unattended-upgrade -v

To make Only download, do not even try to install $ sudo unattended-upgrade --download-only

To make upgrade in minimal steps $ sudo unattended-upgrade --minimal-upgrade-steps

To upgrade all packages together instead of in smaller sets $ sudo unattended-upgrade --no-minimal-upgrade-steps

To show this help message $ sudo unattended-upgrade -h

regards, T.Dhanasekar