Install indicator-keyboard by entering the following commands in the terminal:
sudo apt update sudo apt install indicator-keyboard
Description:
Keyboard indicator
This package contains the keyboard indicator, which should show as an icon in the top panel when using the Unity environment. It can be used to switch key layouts or languages, and helps the user identifying which layouts are currently in use.
Homepage: https://code.launchpad.net/indicator-keyboard
Version: 0.0.0+18.04.20180216-0ubuntu1
Section: universe/gnome