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I was trying to install VPN server and followed some 'tutorials' and now I end up with eth0 - unmanaged.

when called 'network-admin' there is no tab 'connection' just General,DNS,Hosts. WiFi works fine, but cable looks dead. It says 'Wired unmanaged' and no option to reset or ad new connection or any 'manage' option.

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Found it! "To resolve this, all you need is to remove all other interface except lo from /etc/network/interfaces sudo cat /etc/network/interfaces #working config auto lo iface lo inet loopback sudo cat /etc/network/interfaces #previous non-working config auto lo iface lo inet loopback auto eth0 iface eth0 inet manual Once you are done with necessary changes, restart netwok-manager sudo service network-manager restart" AFTER:… Thanks anyway :) Pifon – Pifon Feb 14 '12 at 7:17
up vote 4 down vote accepted

During your tutorial-following, you have probably added a definition for eth0 in /etc/network/interfaces. If an interface is defined in this file, Network Manager assumes that you want to control it manually, and so doesn't manage it for you.

If this is indeed the problem, you can fix it by reverting /etc/network/interfaces to its default. It should look something like:

auto lo
iface lo inet loopback

-- importantly, not containing any stanzas for eth0.

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You are absolutely right. Thank you :) – Pifon Feb 14 '12 at 11:10

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