Lean, fast and powerful, Ubuntu Server delivers services reliably, predictably and economically. It is the perfect base on which to build your instances. This image comes with the Ubuntu Desktop package, that includes a GUI (graphical user interface) powered by Gnome configured with VNC for remote access.

Newer version available: "Ubuntu Desktop Basic 21.04 - Web and RDP" : https://aws.amazon.com/marketplace/pp/prodview-gjm6goktjqpiu

Also see:
Ubuntu 18.04 LTS - GUI Gnome VNC - https://aws.amazon.com/marketplace/pp/B08KWJR454/
Ubuntu 20.04 LTS - GUI Gnome VNC - https://aws.amazon.com/marketplace/pp/B08KTMRYVQ/