ok pls do following
dietpi-software install 182
once you hit by the error, you have the possibility to Open subshell from the error handle. On the subshell do following
rm -vf /etc/unbound/unbound.conf.d/{dietpi-pihole,pi-hole}.conf
G_CONFIG_INJECT 'port:[[:blank:]]' ' port: 5353' /etc/unbound/unbound.conf.d/dietpi.conf
G_CONFIG_INJECT 'interface:[[:blank:]]' ' interface: 127.0.0.1' /etc/unbound/unbound.conf.d/dietpi.conf
G_CONFIG_INJECT 'verbosity:[[:blank:]]' ' verbosity: 3' /etc/unbound/unbound.conf.d/dietpi.conf
G_CONFIG_INJECT 'log-queries:[[:blank:]]' ' log-queries: yes' /etc/unbound/unbound.conf.d/dietpi.conf
exit the subshell and hit Retry on the error handle