Krfb
Desktop Sharing utility
Krfb Desktop Sharing is a server application that allows you to share your current session with a user on another machine, who can use a VNC client to view or even control the desktop.
KDE Desktop Sharing is a manager for easily sharing a desktop session with another system. The desktop session can be viewed or controlled remotely by any VNC or RFB client, such as the KDE Remote Desktop Connection client. . KDE Desktop Sharing can restrict access to only users who are explicitly invited, and will ask for confirmation when a user attempts to connect. . This package is part of the KDE networking module.
How to install Krfb in Ubuntu
If you are on a supported distro, you can install the application through software center by clicking the below link.
If the above link not working, run the below command in terminal to install krfb in Ubuntu
sudo apt install krfb