How do I ask apt-get to skip any interactive post-install configuration steps?

You can do a couple of things for avoiding this. Setting the DEBIAN_FRONTEND variable to noninteractive and using -y flag. For example:

export DEBIAN_FRONTEND=noninteractive
apt-get -yq install [packagename]

If you need to install it via sudo, use:

sudo DEBIAN_FRONTEND=noninteractive apt-get -yq install [packagename]

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