Domanda Problematica assegnazione dhcp

[Eoloprox]

Hola a todos!

Sto cercando di creare un AccessPoint con annessi dhcp in una RaspberreyPI3, su Ubuntu Server, quando lancio il demone di DNSmasq, rompe le balle, in questa maniera:

Jan 25 20:03:11 ubuntu systemd[1]: Starting dnsmasq - A lightweight DHCP and caching DNS server...
Jan 25 20:03:11 ubuntu dnsmasq[1527]: dnsmasq: syntax check OK.
Jan 25 20:03:11 ubuntu dnsmasq[1528]: dnsmasq: failed to create listening socket for port 53: Address already in use
Jan 25 20:03:11 ubuntu dnsmasq[1528]: failed to create listening socket for port 53: Address already in use
Jan 25 20:03:11 ubuntu dnsmasq[1528]: FAILED to start up
Jan 25 20:03:11 ubuntu systemd[1]: dnsmasq.service: Control process exited, code=exited, status=2/INVALIDARGUMENT
Jan 25 20:03:11 ubuntu systemd[1]: dnsmasq.service: Failed with result 'exit-code'.
Jan 25 20:03:11 ubuntu systemd[1]: Failed to start dnsmasq - A lightweight DHCP and caching DNS server.

Pecchè?