This file is indexed.

postinst is in lightdm-webkit-greeter 0.1.2-0ubuntu2.

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" = configure ]; then
  update-alternatives --install /usr/share/lightdm-webkit/themes/default \
    lightdm-webkit-theme /usr/share/lightdm-webkit/themes/webkit 5
fi