This file is indexed.

/usr/src/glibc/debian/debhelper.in/libc-alt.postrm is in eglibc-source 2.15-0ubuntu10.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#! /bin/sh
set -e

if [ "$1" = remove ]; then
    ARCH=${DPKG_MAINTSCRIPT_ARCH:-$(dpkg --print-architecture)}
    if [ "${ARCH}" = "amd64" ] && [ "LIBC-FLAVOR" = "libc6-i386" ]; then
	if [ -h /lib/ld-linux.so.2 ] && [ ! -f /lib/ld-linux.so.2 ]; then
	    rm /lib/ld-linux.so.2
	fi
    fi
fi

if [ "$1" = deconfigure ]; then
    :; # blah, do something useful with ldso
fi

#DEBHELPER#

exit 0