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Some APT packages upgrade without asking any questions, e.g. if no configuration files are changed. Others don't.

I would like to check if a package needs or "wants" interaction on upgrade.

I do not mean forced, non-interactive installs/upgrades like https://serverfault.com/a/227194/174041. I would simply like to automate "safe" upgrades (I have unattended security upgrades anyway, but would like to also automatically upgrade packages that can be relatively safely upgraded in automated manner).

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  • @anx: Back out and warn / produce error, abort the whole effort. Commented Jan 29, 2019 at 8:18

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If you use 

apt-cache show postifx

you will see it depends on debconf which is commonly used to ask questions during package setup. And this shows:

apt-cache show debconf ... Description-en: ...Packages use Debconf to ask questions when they are installed. ...
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