Please attach the contents of /run/nm-dns-dnsmasq.conf. That file should contain exactly the information received from DHCP, and /etc/resolv.conf should contain just "127.0.0.1" (thus pointing to dnsmasq); on a standard vanilla Ubuntu install.
Please attach the contents of /run/nm- dns-dnsmasq. conf. That file should contain exactly the information received from DHCP, and /etc/resolv.conf should contain just "127.0.0.1" (thus pointing to dnsmasq); on a standard vanilla Ubuntu install.