This file is indexed.

postinst is in xscreensaver-gl 5.36-1ubuntu1.

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 [ -L /etc/X11/app-defaults/XScreenSaver ]; then
    if [ "$(readlink /etc/X11/app-defaults/XScreenSaver)" = "XScreenSaver-nogl" ]; then
        rm /etc/X11/app-defaults/XScreenSaver
    fi
fi

cd /etc/X11/app-defaults
if [ ! -e XScreenSaver ]; then
    if [ -f XScreenSaver-gl ]; then
        ln -sf XScreenSaver-gl  XScreenSaver
    else
        ln -sf XScreenSaver-nogl XScreenSaver
    fi
fi