I saw that you have uploaded Raspberry Pi Images for ubuntu 20.04 LTS. Till now I was using Raspberry Pi 4 and ubuntu 16.04 LTS but I wanted to update ubuntu and ROS versions to the latest ones. I see that it is possible now. My idea is to test some of the examples for path planning with RP Lidar realized with the latest versions of ubuntu and ROS2. What is the difference between ubuntu 20.04 LTS and ubuntu 20.04+GDM3. Which one of them is better to use? Thank you in advance!