Cannot open "Display" settings, error "Could not get screen information"

Display in Settings menu shows

Could not get screen information

And Change Desktop Background on Right-Click menu just opens Settings.

Is it bug in update, or did I do something?

I had the same issue which I solved through re-installing the Ubuntu desktop by

sudo apt-get install --reinstall ubuntu-desktop

The above solution was not working (tried it under 16.04 LTS)
But thanks to
http://pifuge.com/ubuntu/fjvU-ubuntu-could-not-get-screen-information-after-upgrade
From a terminal window, I did

ps x|grep control-center

found gnome control-center process running, killed it using the good old kill -9
and launch unity-control-center instead

All display information are there