This file is indexed.

preinst is in update-notifier 0.119ubuntu8.1.

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

# check if we have a unmodified conf-file rm upgrade-notifer
if [ -f /etc/apt/apt.conf.d/99upgrade-notifier ]; then
    if echo "9aff569ff6afcff455d5ba59c0587bab  /etc/apt/apt.conf.d/99upgrade-notifier" | md5sum -c 2>/dev/null; then
        rm -f  /etc/apt/apt.conf.d/99upgrade-notifier
    fi
fi