To get the details of installing RealVNC server on the computer Please Refer this site
The default desktop of Ubuntu 17.10 can not be viewed remotely using RealVNC viewer as it gives a blank screen.
Desktop view of the Ubuntu 17.10 PC with RealVNC server
Blank screen of the mobile phone with RealVNC viewer when trying to connect with the Ubuntu 171.10 PC
To view the remote desktop I have successfully adopted the following simple procedure.
The default desktop of Ubuntu 17.10 ,has to be changed from Ubuntu to Ubuntu on Xorg
Start computer and make changes (select Ubuntu on Xorg) in the Ubuntu login screen as follows
Ubuntu login screen
Then enter the password of the computer and start
Now the problem is solved
Desktop screen of the Ubuntu 17.10 PC (wih RealVNC server)
Remote view of the Ubuntu 17.10 PC on a mobile phone ( with RealVNC viewer)