Apply to Ubuntu Server 18.04.

With netplan, to configure network interfaces, we have to edit the *.yaml files in /etc/netplan/ directory.

Below is an example config to set a static IP address for enp0s3 ethernet interface:

network:
    ethernets:
        enp0s3:
            addresses:
              - 10.72.119.11/24
            gateway4: 10.72.119.254
            nameservers:
              addresses: [8.8.8.8, 1.1.1.1]
    version: 2

After saving the change, run netplan apply command to apply the change. This command must run with root permission.