Install gnome-shell-extension-onboard by entering the following commands in the terminal:
sudo apt update sudo apt install gnome-shell-extension-onboard
Description:
GNOME Shell extension for the on-screen keyboard Onboard
This package hides the official GNOME3 keyboard and provides an icon to show/hide Onboard. It is only an initial extension that does not show Onboard for activities and passwords, yet.
Homepage: https://launchpad.net/onboard
Version: 1.4.1-2ubuntu1
Section: universe/gnome