One of the problems you will have with many (any?) of the solutions proposed is they rely on the current state of your local apt package metadata cache. Which is to say, if that is not up-to-date, then you are only going to get stale information; and you need to be root to update it.
I would suggest installing and enabling unattended-upgrades iiwy. -- Jonathan Dowland Please do not CC me, I am subscribed to the list.
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