This file is indexed.

/usr/share/kernel-common/examples/etc/kernel/header_prerm.d/link is in kernel-common 13.018+nmu1.

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/bash

version=$1

if [ -n "$DEB_MAINT_PARAMS" ]; then
    eval set -- "$DEB_MAINT_PARAMS"
    if [ -z "$1" ] || [ "$1" != "remove" ]; then
        exit 0;
    fi
fi
# passing the kernel version is required
[ -z "$version" ] && exit 1

HEADERDIR=/usr/src/linux-headers-$version

test -d $HEADERDIR || exit 0

# Make sure the asm link is gone
if [ -L $HEADERDIR/include/asm ]; then
    rm $HEADERDIR/include/asm 
fi

exit 0