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UPDATE

This is no longer my preferred answer. I've added another answer here.

Finally, if you do a DNS query with dig, you should see one of your defined nameservers being used and not the stub resolver or your local uplink server. And if it all goes well, it should be using DNS-over-TLS through your VPN.

Finally, if you do a DNS query with dig +tls google.com, you should see one of your defined nameservers being used and not the stub resolver or your local uplink server. And if it all goes well, it should be using DNS-over-TLS through your VPN.

# This is the network config written by 'subiquity'
network:
  ethernets:
    enp0s10:
      dhcp4: true
      dhcp-overrides:
        use-dns: false
  version: 2

# This is the network config written by 'subiquity'
network:
  ethernets:
    enp0s10:
      dhcp4: true
      dhcp4-overrides:
        use-dns: false
  version: 2