ubuntu settings not opening code example

Example 1: settings doesn't open ubuntu

#install
sudo apt-get update
sudo apt-get install --reinstall gnome-control-center
#Open Settings by
gnome-control-center display
gnome-control-center

Example 2: settings not opening in ubuntu 18.04

sudo apt-get install --reinstall gnome-control-center

Example 3: settings not showing in ubuntu

run
$ sudo apt-get install ubuntu-desktop

Example 4: linux settings not opening

sudo apt-get remove unity-control-center
sudo apt autoremove
sudo apt-get install unity-control-center