Connect to WiFi on Ubuntu (Server version) via Terminal

This tutorial assume you have an active LAN connected, since you may need to install a package.

sudo apt install network-manager

Then you can use the below interactive mode to search for wifi and connect to the same

sudo nmtui

Now I can see the Wlan0 link is UP (which was DOWN before) and it has got an IP too.

Found this really easy if you got a LAN or your ubuntu version has network-manager pre installed.