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You may find it's annoying if your screen automatically turns off every 10 minutes of inactivity and you should login again each time. This is called lock screen and this automatically disables your network so any upgrade or other long-run process will be interrupted if this is activated. So, to disable it, especially on Ubuntu 17.10 and 18.04 with GNOME 3 interface, follow these steps:
Go to System Settings > Power > turn OFF the Dim screen when inactive option > select NEVER for Blank screen option.
Go to System Settings > Privacy > click at "On" button at Screen Lock option > a small dialog appears > turn OFF the Automatic Screen Lock option > turn OFF Show Notifications option > finally, make sure the Screen Lock option turned OFF.
As simple as that. Happy working!
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