This file is indexed.

preinst is in nbd-server 1:2.9.25-2ubuntu1.

This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.

The actual contents of the file can be viewed below.

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#!/bin/sh

# If upgrading from pre-2.9, move /etc/nbd-server away.

if [ "$1" = "upgrade" ]
then
	if dpkg --compare-versions "$2" lt 2.9
	then
		mv /etc/nbd-server /etc/nbd-server.oldconf
	fi
fi