Add or change keyboard layout on Lubuntu 16.04

Question

I would like to change the keyboard layout on Lubuntu 16.04, that by default only has the US layout. When I open the Keyboard Layout Handler programme all the controls to change keyboard model or layout are greyed out:

Is there any other way of adding and changing keyboard layouts on Lubuntu?

Solution

It turns out it was only a matter of disabling the Keep system layouts option, whose function is a mystery to me.