I'm trying to support a naive user remotely (using teamviewer). She has a problem where update-manager is not automatically starting (had not shown an software updates window for weeks until today). Checking the "Software & Updates" settings, everything looks fine (check for updates daily, display immediately when there are security updates).
So, how is update-manager supposed to be automatically started? (if I know this I can try to debug) For example, to illustrate the kind of answer I'm hoping for:
- aptd? Via what configuration, triggered how?
- Some init.d script? Which one?
- upstart? Which job file?
- systemd? Which unit file?
- cron? Which crontab?
Bonus points for clues re why it might be failing!