Pi-hole + unbound default setup not working on validation

There's also a chance that unbound's package installation messed up the configuration on Bullseye OS variants.

Try the following:

  1. Edit file /etc/resolvconf.conf and comment out the last line which should then read:

#unbound_conf=/etc/unbound/unbound.conf.d/resolvconf_resolvers.conf

  1. Delete the unwanted unbound configuration file:

sudo rm /etc/unbound/unbound.conf.d/resolvconf_resolvers.conf

  1. Restart unbound:

sudo service unbound restart