Install freerdp2-shadow-x11 by entering the following commands in the terminal:
sudo apt update sudo apt install freerdp2-shadow-x11
Description:
FreeRDP x11 shadowing server
FreeRDP is a libre client/server implementation of the Remote Desktop Protocol (RDP). . This package contains a "shadowing" server that can be used to share an already started X11 DISPLAY.
Homepage: http://www.freerdp.com/
Version: 2.0.0~git20170725.1.1648deb+dfsg1-7
Section: universe/x11