Ubuntu Remote Desktop

Ubuntu 18.04

https://websiteforstudents.com/connect-to-ubuntu-16-04-17-10-18-04-desktop-via-remote-desktop-connection-rdp-with-xrdp/

sudo apt install xrdp
sudo systemctl enable xrdp
reboot

Then you can connect via RDP from another machine.

In Windows, you can use the built-in mstsc.exe Remote Desktop Client.