I'm looking at the Ubuntu 18.04 (Gnome) Software & Updates tool, and it has two settings... and I'm not sure what the difference is between them, so maybe someone else will know that. The first setting "Automatically check for updates" will only let you check Daily as the most frequent. But the other setting "When there are other updates" will let you choose Display immediately. Maybe that is what you want, but I'm not sure.Is there anyway to schedule the update notifier to check for updates every there's an update available?
Okay, but also is there a command to trigger the update notifier to check for updates?
sudo apt-get update
sudo apt-get update && sudo apt-get upgrade