This file is indexed.

postinst is in gui-apt-key 0.4-2.1.

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

test -x /usr/bin/update-menus && /usr/bin/update-menus || /bin/true
test -x /usr/bin/update-desktop-database && update-desktop-database -q || /bin/true