[53] is in use by unbound (https://discourse.pi-hole.net/t/hardware-software-requirements/273#ports)
[53] is in use by unbound (https://discourse.pi-hole.net/t/hardware-software-requirements/273#ports)
Either disable unbound or move it to another port. Our guide for unbound contains a configuration file that will set up unbound nicely to work with Pi-hole.