Disable automatic package updates (GUI)
Open dconf-editor, then follow the next steps:
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org -> gnome -> software
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Select 'download-updates'.
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Scroll down until the end and set "use default value" to "false".
Disable automatic package updates (Terminal)
Open the file /etc/apt/apt.conf.d/20auto-upgrades and then change the values from 1 to 0, example:
APT::Periodic::Update-Package-Lists "0"; APT::Periodic::Unattended-Upgrade "0"; eval(ez_write_tag([[970,250],'tutorials_technology-medrectangle-3','ezslot_1',114,'0','0']));