Update - After plugging in a USB ethernet adapter and restarting network manager recognizes the USB ethernet adapater but not the internal Realtek adapter.
Maybe this bug if filed in the wrong place. Appears to be a problem with the Realtek RTL-8169SC adapter. -- Network Manager Does Not Recognize Wired Network (eth0) https://launchpad.net/bugs/54411 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
