This file is indexed.

preinst is in libc6-i386 2.15-0ubuntu10.18.

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
    (upgrade|install)
        if dpkg --compare-versions "$2" lt "2.13-23ubuntu1"; then
            if [ -f /etc/ld.so.conf.d/biarch-compat.conf ]; then
                mv /etc/ld.so.conf.d/biarch-compat.conf \
                  /etc/ld.so.conf.d/zz_${DPKG_MAINTSCRIPT_PACKAGE#*-}-biarch-compat.conf
            fi
        fi
    ;;
esac