This file is indexed.

preinst is in libglib2.0-data 2.40.2-0ubuntu1.1.

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 2.27.5-2; then
    rm -f /usr/share/doc/libglib2.0-data
fi