Stop Onscreen Keyboard ‘Onboard’ Auto-Starting in Ubuntu 18.04

1. Open terminal by pressing Ctrl+Alt+T or searching for “Terminal” in Unity Dash. When it launches, run command:

sudo sed -i "s/NoDisplay=true/NoDisplay=false/g" /etc/xdg/autostart/*.desktop

Type in your password (no visual feedback due to security reason) when it asks. The command will show hidden startup applications in the Startup Applications utility including Onboard.