As of Ubuntu 18.04 the default network stack uses something called Netplan. To see which version of Ubuntu you have, do cat /etc/issue. If you have an older version see this article.
In order to do a Netplan configuration, follow the instructions below.
First determine your interface name with ip a
Then edit the Netplan configuration file:
cd /etc/netplan/ ls vi 50-cloud-init-yaml
Example Netplan configuration file:
network:
ethernets:
eth0:
dhcp4: no
addresses: [192.168.0.20/24]
gateway4: 192.168.0.1
nameservers:
addresses: [1.1.1.1, 8.8.4.4]
version: 2
To test:
`sudo netplan try`
Enter to accept changes.
References:
https://www.linux.com/learn/intro-to-linux/2018/9/how-use-netplan-network-configuration-tool-linux