I have just set up a new, stripped down Ubuntu 16.04 LTS server, with automatic updates turned off. Over the weekend it mysteriously updated /boot/grub/grub.cfg, which started a whole bunch of kernel threads and a few daemons that I don't want/need running (like metad etc - disabled in systemd).
Looking at the system logs and journalctl shows when this happened but not what actually caused update-grub or equivalent to run. I've looked through systemctl and the cron job directories looking for possible job files but nothing stands out.
- What job does this unattended update-grub?
- Are there better logs or tools for finding out what is running this job?
Many thanks in advance,