First you need to open software Sources which can be easily done by searching 'Software Sources' in the dash:
Next navigate to the 'updates' tab:
Change update check frequency
From the 'Automatically check for updates' drop-down menu select from: 'Daily', 'Every Two Days', 'Weekly', 'Every Fortnight', 'Never'.
Automatically install security updates
From the 'When there are security updates' drop-down menu select 'Download and install automatically'
When prompted enter your password to confirm the changes.
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