When it comes to Ubuntu network interface configuration, the way in which you set a static IP has completely changed. The previous LTS version Ubuntu 16.04 used /etc/network/interface file to configure static IP addresses, but Ubuntu 18.04 use new method known as netplan.
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How to configure static IP address on Ubuntu 20.04 Focal
Setting Up Static IP Address on Ubuntu 20.04 LTS – Linux Hint As you can see, the new IP information is applied to the network interface. So, this is how you set a static IP address on Ubuntu Desktop 20.04 LTS graphically using Network Manager. Setting Up Static IP on Ubuntu Server 20.04 LTS: Ubuntu Server 20.04 LTS uses Netplan for network configuration by default. How To Configure Static IP Address on Ubuntu 20.04/18.04 Jan 11, 2020
May 09, 2019
How to Assign Static IP Address on Ubuntu Linux - It's FOSS