Install x11vnc-data by entering the following commands in the terminal:
sudo apt update sudo apt install x11vnc-data
Description:
data files for x11vnc
This package contains the data files for x11vnc, a VNC server allowing remote access to an existing X session. Unless you have 'x11vnc' package installed, you probably won't find this package useful.
Homepage: http://www.karlrunge.com/x11vnc/
Version: 0.9.13-3
Section: universe/x11