On melody, using DHCP, dig and nslookup did not work
because they could not find a server.

This was because they were using systemd-resolved's
stub resolver.

It was necessary to edit /etc/systemd/resolved.conf:

#DNSStubListener=yes
DNSStubListener=no

This was not a problem on una, because ip configuration
is static, and systemd-resolved is disabled.
(nameserver configured in non-linked resolv.conf)