Do you want to connect your tablet or mobile phone to your Linux desktop as a second monitor?
So I decided to create a script that configures your X11 server and creates a VNC server automatically.
Yes, is working!
I am using Ubuntu 16.04 and an Android tablet.
It should work for both iOS and Android or any other device capable of running a VNC client.
It can do both landscape and portrait mode.
For androidians, it can also connect to your device through USB!
Let me know how it goes...