This file is indexed.

postinst is in lightdm-gtk-greeter 1.1.5-0ubuntu1.

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 dpkg-maintscript-helper supports mv_conffile; then
  dpkg-maintscript-helper mv_conffile \
    /etc/lightdm/lightdm-gtk-greeter.conf \
    /etc/lightdm/lightdm-gtk-greeter-ubuntu.conf \
    1.0.0-0ubuntu1 -- "$@"
fi    

if [ "$1" = "configure" ] ; then
  update-alternatives --install /etc/lightdm/lightdm-gtk-greeter.conf \
    lightdm-gtk-greeter-config-derivative \
    /etc/lightdm/lightdm-gtk-greeter-ubuntu.conf 10
fi

case "$1" in
  configure|upgrade)
    /usr/lib/lightdm/lightdm-set-defaults --keep-old --greeter=lightdm-gtk-greeter || true
  ;;
esac



exit 0