Permanent DNS setup on Ubuntu 18

1. Install the resolvconf package.

   sudo apt install resolvconf

2. Edit /etc/resolvconf/resolv.conf.d/head and add the following:

   # Make edits to /etc/resolvconf/resolv.conf.d/head.
   nameserver 8.8.4.4
   nameserver 8.8.8.8

3. Restart the resolvconf service.

   sudo service resolvconf restart