Ubuntu Network Manager Greyed Out – Grayed Out

***Note: As of this writing, if you’re using x2go client there is an issue with network-manager an D-bus.

 

This can occur if network-manager and network-manager-openvpn were installed after the system was setup.

 Try editing /etc/NetworkManager/NetworkManager.conf and change managed=false to managed=true as below, then reboot.

[main]
plugins=ifupdown,keyfile

[ifupdown]
managed=true     

 

This can occur with Ubuntu 11, 12, 13, 14 etc…

 

http://ubuntuforums.org/showthread.php?t=1847900&p=11273302#post11273302

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