How to Fix the "Device Not Managed" Error in Network Manager

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Network Manager is an essential utility for Linux, designed to connect Linux users to the Internet and other networks. For most of the time, this program works flawlessly, but it is not perfect. One common problem is that this program will display the error message “Device not managed”. This problem can be easily fixed by following these few, simple steps.

Steps

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    This can be done by pressing Ctrl + Alt + T . Then type in the following command: gksu gedit /etc/NetworkManager/NetworkManager.conf You will be required to give an administrative password.
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    In the last line, replace the managed=false to managed=true . Then save the file and exit the editor.
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    If you don't want to restart your PC, then give the terminal this command: sudo restart network-manager .
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