“Device not managed” is an error that you might get while configuring your internet network on ubuntu using wired or ethernet cable..
This could occur on any ubuntu version..
ubuntu linux, ubuntu download, ubuntu server, ubuntu 12.04, ubuntu usb, ubuntu 14.04, ubuntu 10.04, ubuntu desktop
This happens only when you have not configured your networkmanager.conf file yet..
That you can do watching this video..
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