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I have a Raspberry Pi (Raspbian/Debian Bullseye) that's set up with a cellular modem as its only internet-connected network interface. To reduce data costs, I want to restrict Raspbian's network usage to only my app. Letting it run for a few days with nethogs inspecting network usage, it seems like something is triggering automatic apt updates, consuming around 30KB/day.

I've already disabled and masked apt-daily.service, apt-daily-upgrade.service, apt-daily.timer, and apt-daily-upgrade.timer. cat /var/log/syslog | grep apt is empty, and /var/log/apt/*.log show no activity.

Given the total payload size, it's definitely doing apt update in the background, because I can trigger the exact same network footprint with sudo apt update manually. How can I find out what's triggering it?

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  • unattended upgrades? Commented Jun 6, 2022 at 0:15
  • unattended-upgrades is not installed Commented Jun 6, 2022 at 1:33
  • 1
    did you check your cron jobs? e.g. sudo grep -i 'apt.*update' /etc/crontab /etc/cron*/* /var/spool/cron/crontabs/* Commented Jun 6, 2022 at 16:43

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Found it! It was packagekit doing a daily source list update. Stopped and masked the packagekit service, then suppressed a complaint on every subsequent apt operation that the service is masked by following these instructions: https://medium.com/opsops/how-to-disable-packagekit-f935207044c1

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