keylaunch – A utility for binding commands to a hot key
Quickly access and add or edit your Metacity Key-bindings Ability to reset key-bindings
Resetting of key-bindings
select which command you want to edit, and when the file selection window should open, click the cancel button. The key-binding command should disabled
Install keylaunch in ubuntu
First you need to dopwnload key launch from here once you download you need to extract and give execute permissions to this script
unzip 128678-KeyLaunch.sh.zip
chmod +x KeyLaunch.sh
./KeyLaunch.sh
Screenshot
I would have appreciated this four or five years ago. It seems less relevant and quite limited in comparison to GNOME Do http://do.davebsd.com/