Debian GUI: network works but no managed information?

[admin]

After default Debian install, it could be (in my case) that network manager does not 'see' the eth0 card, although your network is working!

Found the solution: interface appears in /etc/network/interfaces. By default, NetworkManager does not manage interfaces that appear in /etc/network/interfaces.
You can change this behaviour. To do this - in a terminal:

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sudo nano /etc/NetworkManager/NetworkManager.conf

change the line managed=false to managed=true
Save, stop and start network manager:

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sudo service network-manager restart

And in GUI you should see now: