In this video I show how to install ubuntu 20.04 on the rpi4.This is a new method and you get better performance if you use this method.
Raspberry Pi Imager--https://www.raspberrypi.org/downloads/
First let it boot up then press enter.
Login:ubuntu
Password:ubuntu
Then change the password.
Then
1- git clone https://github.com/wimpysworld/deskto...
2- cd ./desktopify
3- sudo ./desktopify --de ubuntu
Instead of ubuntu you can install--
lubuntu
kubuntu
ubuntu-budgie
ubuntu-kylin
ubuntu-mate
ubuntu-studio
xubuntu