Systemd-resolved durch DNSmasq ersetzen

Ab Ubuntu 18.04

Default:

ls -l /etc/resolv.conf 
lrwxrwxrwx 1 root root 37 Jul 11 22:23 /etc/resolv.conf -> /run/systemd/resolve/stub-resolv.conf

https://blog.yumdap.net/ubuntu-17-04-dns-mit-dnsmasq-statt-systemd/
https://askubuntu.com/questions/898605/how-to-disable-systemd-resolved-and-resolve-dns-with-dnsmasq
https://cnly.github.io/2017/09/02/ubuntu1704-dnsmasq-resolvconf.html
https://github.com/hashicorp/consul/issues/4155