In Ubuntu Gnome,there’s a Windows control-panel-like interface called Control Center that you can easily manager your system.This is disabled by default and following is how to enable this in Ubuntu Gnome desktop environment.

Right-click on start Applications menu,select Edit Menus.In left box,choose System->check Control Center in right

gnome_control_center

gnome_control_center1

Alternatively,go to System->Preferences->Main menu->choose System in left and check the check-box in right.

Control Center can be launched from System menu.
This is the screenshot of control center:
gnome_control_center2