This file is indexed.

/etc/kernel/postrm.d/zz-u-boot-menu is in u-boot-menu 2.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh

set -e

# Exit if extlinux was removed (!= purged)
if [ -x /usr/sbin/u-boot-update ]
then
	# Update extlinux configuration
	u-boot-update
fi