This file is indexed.

postrm is in klibc-utils 2.0.4-8ubuntu1.

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 -e

if [ "$1" = remove ] || [ "$1" = abort-install ] || [ "$1" = disappear ] || \
   { { [ "$1" = abort-upgrade ] || [ "$1" = upgrade ]; } && \
     dpkg --compare-versions "$2" lt 2.0.4-8~; }; then
    # Restore the klibc hook installed by older versions of initramfs-tools
    dpkg-divert --package klibc-utils --remove --rename \
		--divert /usr/share/initramfs-tools/hooks/klibc^i-t \
		/usr/share/initramfs-tools/hooks/klibc
fi