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I have a server build script which uses apt-get to install packages. It then puts pre-written configuration files directly in place, so the interactive post-install configuration dialog in packages such as postfix is not needed. How do I skip this stage of the installation? It creates a piece of manual intervention that I would rather avoid.

I am aware of the -qq option, but the manpage warns against using it without specifying a no-action modifier. I do want to perform an action, I just want to suppress a specific part of it.

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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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    This worked for me until one day it didn't. Some kind of "urgency=high" message. You need DEBIAN_FRONTEND, y AND the q flag set, i.e. DEBIAN_FRONTEND=noninteractive apt-get -yq install [packagename] – Jeff Mixon Jul 20 '16 at 6:45

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