Edit file File name : ndisc6.postinst Content :#!/bin/sh set -e case "$1" in configure) update-alternatives \ --install /usr/bin/traceroute6 traceroute6 /usr/bin/rltraceroute6 110 \ --slave /usr/share/man/man8/traceroute6.8.gz traceroute6.8.gz /usr/share/man/man8/rltraceroute6.8.gz ;; esac exit 0 Save