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.
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
/etc/NetworkManager/system-connections but no luck. How can I set up NM to manage