If you are looking for Control Panel application in Ubuntu / Linux, then you should use the Control Center application in Ubuntu.
Enable Control Center (Control Panel)
To enable the Control Center (Control Panel), follow the steps below:
Open the Main Menu by clicking on:
System -> Preferences -> Main Menu
A Main Menu window will appear, with the Menus on the left, and their Items on the right.
Now select System from the Menu on left, and then choose and check the Control Center in Items on right and close the window.
Please note, if the Control Center is already selected and checked in the System Items, then you simply have to select it to open the Control Center (Control Panel).
How To Open Control Panel / Where To Find Control Panel (Control Center)
Now choose the Control Center through:
System -> Control Center
and start using the Control Center (Control Panel) you were looking for in Ubuntu.