Wired connection (eth0) is working but network manager icon shows no network

Question

After updating my network-manager, my wired connection continued to work, but it shows no notification; the double arrow is also missing, and the network manager just shows that "no connection" icon. How can I fix this?

Answer 1

Edit your NetworkManager.conf file. One of these two commands should work, depending on your Ubuntu version (the first command worked in my 14.04 installarion).

gksu gedit /etc/NetworkManager/NetworkManager.conf

gksu gedit /etc/NetworkManager/nm-system-settings.conf

The opened document should have these lines:

[ifupdown]
managed=false

Change them to:

[ifupdown]
managed=true

Finally, you need to restart your network-manager. Do this at the terminal:

sudo service network-manager restart

Source: http://ubuntuforums.org/showthread.php?t=1079394