SHELL

ubuntu settings missing

# Settings icon missing?
# Open settings from the terminal
gnome-control-center

# If it is (somehow) not installed anymore..:
sudo apt install gnome-control-center

# Else:
sudo apt remove --purge gnome-control-center sudo apt install gnome-control-center

setting missing in ubuntu

sudo apt install gnome-control-center 
#If you are getting still problem go through the source video