xbindkeys is a program that allows you to launch shell commands with your keyboard or your mouse under X Window. It links commands to keys or mouse buttons, using a configuration file. It’s independent of the window manager and can capture all keyboard keys .
xbindkeys-config-An easy to use gtk program for configuring Xbindkeys.GTK Configure program for xbindkeys.
If you want to create custom keyboard shortcut it is very easy to create
First you need to install xbindkeys using the following
sudo apt-get install xbindkeys
Install xbindkeys-config, it’s a GTK frontend for xbindkeys so it’ easy to configure xbindkeys with that.
sudo apt-get install xbindkeys-config
Then launch the GUI to configure custom keyboard shortcut in Ubuntu