Linux Babe published a tutorial about connecting to Wi-Fi from Terminal on Ubuntu 18.04/19.10 with WPA Supplicant.

Connect to Wi-Fi From Terminal on Ubuntu 18.04/19.10 with WPA Supplicant

In this tutorial, we are going to learn how to connect to Wi-Fi network from command line on Ubuntu 18.04/19.04 server and desktop using wpa_supplicant.

Connect to Wi-Fi From Terminal on Ubuntu 18.04/19.10 with WPA Supplicant - LinuxBabe