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I've made a new install of 12.04 on a PC with Realtek RTL8111/8168B PCI Express Gigabit Ethernet controller. The controller used to work during installation but when the system has been installed it has stopped working.

UPDATE:

There was a problem with the driver - SOLVED here. Now Realtek card is working, I can manually assign and IP and so on but Realtek wired interface is not managed by Network Manager.

I was trying to add information for eth0 at /etc/NetworkManager/system-connections but no luck. How can I set up NM to manage eth0?

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SOLVED: To make Network Manager to take control over a wired connection I had to edit /etc/network and comment all lines related to eth0: # auto eth0 # iface eth0 inet dhcp reboot and now wired connection controlled by NM. – user116190 Dec 22 '12 at 14:38

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