*** This bug is a duplicate of bug 88327 ***
    https://bugs.launchpad.net/bugs/88327

This has happened to me about 3 times in the last month.
ii  network-manager                            0.6.4-6ubuntu7                   
          network management framework daemon
ii  network-manager-gnome                      0.6.4-6ubuntu7                   
          network management framework (GNOME frontend

I've noticed that there are some defunct dhcp processes when this happens:
29020 ?        00:00:00 dhclient <defunct>
29927 ?        00:00:00 dhclient3
31366 ?        00:00:00 dhclient <defunct>

This usually helps:
  killall nm-applet
  sudo /etc/dbus-1/event.d/26NetworkManagerDispatcher stop
  sudo /etc/dbus-1/event.d/25NetworkManager stop
  sudo /etc/dbus-1/event.d/25NetworkManager start
  sudo /etc/dbus-1/event.d/26NetworkManagerDispatcher start
  nm-applet &

-- 
NetworkManager fails to bring up wired interface after resume
https://bugs.launchpad.net/bugs/102716
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