$ ssh <user_name>@<server_ip> -X
-X stands for X forwarding, which is used for forwarding GUI windows. Note that SSH doesn’t forward the whole desktop. It forwards only a shell and programs you open with this shell.
Use Remmina (https://www.remmina.org)
$ ssh -L <vnc_port>:127.0.0.1:<vnc_port> <server_ip>
Note that the VNC server has to be configured the right way so that you see the same desktop as the physical user. Normally it creates its own desktop. Also it works best with the fluxbox window manager (http://fluxbox.org/) (Has to be installed on the server and configured in the xstartup file with fluxbox &)
Use Remmina (https://www.remmina.org)
$ echo $DISPLAY