This file is indexed.

preinst is in libpango1.0-0 1.30.0-0ubuntu2.

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

if [ "$1" = "upgrade" ] && dpkg --compare-versions "$2" lt-nl 1.28.3-4; then
    if [ -L /usr/share/doc/libpango1.0-0 ]; then
        rm -f /usr/share/doc/libpango1.0-0
    fi
fi