How to Set DNS Search Order in Ubuntu 18.04 using NetPlan ...
https://www.cloudsavvyit.com/4240/how-to-set-dns-search-order-in-ubuntu-18-04-using-netplan/
Starting in Ubuntu 18.04, network settings, including nameservers, are now controlled through the NetPlan interface. Even prior to 18.04, you were still allowed to make changes to the original resolv.conf , but this file was actually was controlled by NetworkManager and its configuration files, typically located in the /etc/network/interfaces directory.
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