sudo apt-get upgrade installs all updates, not just security updates. I know that I can use Update Manager to select only important security updates, but is there a way to do this from the command line?
The package unattended-upgrades provides functionality to install security updates automatically.
You could use this, but instead of configuring the automatic part you could call it manually:
sudo unattended-upgrade -d --dry-run
sudo unattended-upgrade -d # Idem --debug
If you want to run it quietly instead:
sudo unattended-upgrade
Note: When you call unattended-upgrade you leave the "s" off the end (on newer versions there is a symlink to avoid this).
This assumes that the package is installed by default, which it probably is. If not, just do:
sudo apt install unattended-upgrades
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