Disable automatic updates on Debian&Ubuntu
On Debian（8+）And Ubuntu（16.04+）
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systemctl stop apt-daily.timer
systemctl disable apt-daily.timer
systemctl disable apt-daily.service
systemctl stop apt-daily-upgrade.timer
systemctl disable apt-daily-upgrade.timer
systemctl disable apt-daily-upgrade.service
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Or
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systemctl disable --now apt-daily{,-upgrade}.{timer,service}
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remove update notifier
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sudo apt purge update-notifier-common
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stop automatic security updates
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sudo apt purge unattended-upgrades
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Ubuntu 20.04
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Ubuntu 20.04
# /etc/cron.daily/apt-compat comment
# exec /usr/lib/apt/apt.systemd.daily
# stop the autostart of discovery
sudo mkdir /etc/xdg/autostart/disable
sudo mv /etc/xdg/autostart/org.kde.discover.notifier.desktop /etc/xdg/autostart/disable
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