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"Ubuntu will apply security updates automatically, without user interaction. This is done via the unattended-upgrades package, which is installed by default."

• aruggirello 10mo ago
  Right, but it's a minor annoyance, get rid of it with: sudo apt-get remove --purge unattended-upgrades (doesn't trigger removal of anything else, and you'll enjoy 420kb of additional disk space). OTOH the real issue with Ubuntu is snap(d). Snap packages definitely do auto-update. You may want to uninstall the whole snap system - it's (still?) perfectly possible, if a little bit convoluted, due to some infamous snaps like firefox, thunderbird, chromium, or eg. certbot on servers Or just use Debian or any snap-free fork for the matter. Edit: fixed