You can learn how to install the Xfce desktop environment on Ubuntu 22.04 or 20.04 LTS in a tutorial from Linux Capable.
How to Install Xfce on Ubuntu 22.04 or 20.04
This comprehensive guide will teach you how to install Xfce Desktop Environment on Ubuntu 22.04 or 20.04 LTS. Follow the step-by-step instructions to get Xfce up and to run.