How to disable and enable keyboard in ubuntu?

I have a great trouble because I don't have enough space to put both my keyboard and some other things on my desk. And accidentally pressing some key may cause trouble to the system. So I am looking for one way to lock my keyboard temporarily. Of course I don't want to plug out the keyboard from the computer because it is so inconvenient.

How can I do with this?

xinput -list

⎡ Virtual core pointer                          id=2    [master pointer  (3)]

⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]

⎜   ↳ Logitech USB Optical Mouse                id=9    [slave  pointer  (2)]

⎣ Virtual core keyboard                         id=3    [master keyboard (2)]

    ↳ Virtual core XTEST keyboard               id=5    [slave  keyboard (3)]

    ↳ Power Button                              id=6    [slave  keyboard (3)]

    ↳ Power Button                              id=7    [slave  keyboard (3)]

    ↳ CHICONY HP Basic USB Keyboard             id=8    [slave  keyboard (3)]

    ↳ HP WMI hotkeys                            id=10   [slave  keyboard (3)]