After doing upgrading some softwares and system update, the system settings not opening on Ubuntu 16.04 LTS desktop. Whenever we were clicking on ‘System Settings’ nothing was appearing on Desktop.
The package called unity-control-center is a graphical user interface to configure various aspects of Unity. You can read more about the details on this package from Ubuntu Manpage.
So here we are re-installing the unity-control-center package.
sudo apt-get remove unity-control-center sudo apt autoremove sudo apt-get install unity-control-center
After running above command, problem is solved. Now ‘System Settings’ is opening and working fine.