I also had this problem. The solution was to comment out all lines in /etc/network/interfaces except the loopback interface. n-m cannot control already configured interfaces. If that does not cure the problem then you should take a look at #40125 and probably mark this bug a duplicate.
-- No Networking after Suspend https://launchpad.net/bugs/46883 -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
