This file is indexed.

prerm is in menu 2.1.47ubuntu2.

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 && update-menus --remove --trigger
chmod a-x /usr/bin/update-menus