Ubuntu – Network manager stopped working

14.04internetnetwork-manager

I'm running Ubuntu 14.04 and the network manager suddenly stopped working so I can't access the internet. The network manager icon doesn't appear in the bar. When I access the network manager from settings, there is a blank window (usually there is a history of wifi connections as far as I remember).

On the last session it worked properly. Today suddenly it's not working – neither via ethernet nor via wifi. Although on the Windows internet connection is working properly.

I tried to restart the network manager via the terminal using this command:

sudo service network-manager restart

The output was:
"Stop: Unknown instance:
network-manager start/running, process 2256"

… but the network manager still isn't working (nor after I restarted the PC).

That's all I figured out with my ubuntu skills so I ask for your help. I'll appreciate any tips!

Best Answer

First, I used these commands (thanks, Beleriand):

sudo ifconfig eth0 up
sudo dhclient eth0

Then I solved it by upgrading the network manager: 14.04 - Network manager stopped working

Thank you!

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