How do I disable the on-screen keyboard in the unlock screen?
GUI method
Search for Onboard settings from the gnome-shell overview.
Under General tab and Desktop integration heading, uncheck the option Show Onboard when unlocking the screen.
Command-line method
Thanks to fossfreedom's answer to a similar question
Run the following command in a terminal:
gsettings set apps.onboard xembed-onboard false
If the above is not working, try this one:
gsettings set org.gnome.desktop.screensaver embedded-keyboard-enabled false
worked for me (Ubuntu 12.04).
In the Dash, open Onboard Settings
.
Unmark Show Onboard when unlocking the screen.
Done.
On login page of ubuntu, click human icon on top bar then un check onscreen keyboard.