Looks good.
One step missing though after below bit:
sudo sed -Ei 's/^unbound_conf=/#unbound_conf=/' /etc/resolvconf.conf
sudo rm /etc/unbound/unbound.conf.d/resolvconf_resolvers.conf
It will need an unbound restart after to apply ... if the file was present eg:
sudo service unbound restart
Or a one-liner with the rm:
sudo rm /etc/unbound/unbound.conf.d/resolvconf_resolvers.conf && sudo service unbound restart
