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How can I disable the touchpad while typing on KDE?
Is there such a setting like in gnome?
Application menu -> Utilities -> touchpad management. There, you can ask the system to disable the touchpad when a usb mouse is connected and/or when you are typing.
KDE 4: sudo apt install kde-touchpad
sudo apt install kde-touchpad
kcmshell5 kcm_touchpad or kcmshell4 kcm_touchpad
And you'll even have an option to disable touch and scroll only, leaving you the ability to move the cursor.
Did you try touchpad-indicator? You can install it using these commands while in a terminal:
sudo add-apt-repository ppa:atareao/atareao
sudo apt-get update
sudo apt-get install touchpad-indicator
Required, but never shown