I have already tried the solution provided in Nightlight has stopped working 18.04.1, but it isn't working for me.
In settings, I'm getting the option to turn the night light on or off, and I'm also getting the option to set the night light intensity, but when I'm turning the night light on, nothing happens.
I have uploaded the pictures, you can see no colour change is happening on the screen.
When the night light is off
When the night light is set to automatic
When the night light is set to manual
There is nothing happening on the screen.
I'll be thankful for the help.