Cannot turn on sharing on ubuntu 18.04

After I turn on the slider, nothing happen. When i exit the window and go back to it, it turned off again. I want to use screen sharing. What do I have to do ? Image after turn on the slider


Solution 1:

The screen sharing is featured by Vino vnc server, you just have to install it

sudo apt install vino

FYI, The ssh server (too) can be enabled/disabled on this gnome settings section