Answered by : jordy-u

# 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

Source : https://www.reddit.com/r/Ubuntu/comments/bkjckp/the_settings_icon_has_disappeared_and_i_cant_find/ | Last Update : Thu, 04 Feb 21

Answered by : jittery-jellyfish-dofyuvbefdrj

run
$ sudo apt-get install ubuntu-desktop

Source : | Last Update : Fri, 25 Sep 20

Answered by : arjun-gautam

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

Source : https://www.youtube.com/watch?v=txELxmdYjLU | Last Update : Tue, 13 Jul 21

Answered by : dylan-mukoko

sudo apt install gnome-control-center

Source : https://askubuntu.com/questions/1117175/restore-missing-settings-gnome-control-center-icon-in-ubuntu-18-04 | Last Update : Fri, 10 Jun 22