This file is indexed.

preinst is in mutter-common 3.18.3-0ubuntu2.

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

set -e

case "$1" in
    install|upgrade)
        if dpkg --compare-versions "$2" lt "3.4.1-4"; then
            rm -f /etc/sgml/mutter-common.cat /etc/sgml/mutter-common.cat.old
        fi
    ;;
esac