Hi all,
- I edited my message
After I installed Webmin on Ubuntu 16.04 LTS, changed the DNS on the Network Settings page, all DNS servers but 127.0.0.1 get removed and I can’t add or edit anything. My server now has no DNS.
Help? 
Trying putting the dns info into the interfaces file manually. I’ve run into that before as well but not sure what fixed it.
sudo nano /etc/network/interfaces
Add line for dns-nameservers under your active Ethernet connection. ‘Space’ separated list, not comma separated. Line below has 3 dns servers listed.
iface eth0 inet static
…
…
dns-nameservers 127.0.0.1 8.8.8.8 8.8.4.4