This simple tutorial will disable right-click (context menu) in GNOME desktop on Linux Operating System.

gconf-editor
- From the Application menu click Run Application or simply press Alt+F2
- Type gconf-editor and click Run

apps
- Expand apps by clicking on the small arrow beside it

nautilus
- Scroll down until you reach nautilus, click on the arrow beside it to expand it.

disable_context_menus
- Click on lockdown under nautilus
- Uncheck the box beside disable_context_menus.