Error saving Pihole config after installing Unbound

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As you are running Bullseye, you are likely affected by WARNING: Raspbian October 2021 release bullseye + unbound.

Try the following:

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