Think your computer is the process of being hacked? Or have you just clicked Send on that nasty email to the boss and instantly regretted it? whatever the case, simply right-click the NetworkManager icon (top right of the desktop in the notification area) and uncheck Enable Networking. Bang. Network gone. NetworkManager will even display a little exclamation mark to tell you. To get your network back, repeat, but check the entry in the menu. Next time count to 10 before you click Send.
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