This file is indexed.

postinst is in ubuntu-wallpapers 14.04.0.1-0ubuntu1.

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

case "$1" in
    configure)
        # Workaround LP: #746028
        touch /usr/share/backgrounds/warty-final-ubuntu.png
    ;;

    abort-upgrade|abort-deconfigure|abort-remove)
    ;;

    *)
        echo "$0 called with unknown argument \`$1'" 1>&2
        exit 1
    ;;
esac