I realized full install of Mint 18.3 on my workstation it recently.
I place for years a small file (script) that I created in etc / cron.hourly for this OS to update itself alone.
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apt update && apt dist-upgrade -y
This file has root for owner, its access rights are read and write, it is executable.
My problem is that since this install in 18.3, my cron job does not work anymore !
There are many other pre-installed cron jobs like "fstrim" that should not work too... It's very embarrassing for me.
Do you have an idea to solve that ? Does this come from the fact that the root account is locked ?