I have a similar issue. The problem (in my case) is that pppoeconf modifies the file /etc/network/interfaces, adding the lines:
auto eth0 iface eth0 inet manual so that network-manager stops to handle eth0. I commented these two lines, and network-manager works again. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/571570 Title: network-manager does not manage wired network, no ip address on eth0 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs