Ubuntu will automatically check for updates as soon as it is loaded. We can regulate how often it checks by opening Software & Updates>Updates tab and changing the settings using the drop down menus. The options are daily; Every two days: Weekly; Every fortnight: Never. If we set it to never then the system will only be updated if we run these two commands
Code:
sudo apt update
sudo apt upgrade
That error message could also be due to the user shutting down or a disconnection from the ISP occurs stopping the update process before it is finished.
Regards.
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