XFCE4

Use the xfce4 pack to install XFCE4 and the Jupyter Remote Desktop Proxy into the VCE:

packs:
  xfce4: {}

This provides a full XFCE4 desktop GUI, made available through a browser-based VNC remote desktop interface.

Use the server.default_path setting (Server settings) set to /desktop to make the XFCE4 interface the default UI to load.