Public bug reported:

The wired controller is disabled (grayed out so it can't be clicked) in
the nm-applet after resuming the laptop from suspend.  Attempting to
secure a DHCP offer via terminal (e.g., 'sudo dhclient eth0') fails,
though the network lights on the hardware are physically on.

To get the networking to function again I need to reload the kernel drivers by 
doing the following:
sudo modprobe -r et131x
sudo modprobe et131x

I have a Ethernet controller: Agere Systems ET-131x PCI-E Ethernet
Controller (rev 02)

** Affects: ubuntu
     Importance: Undecided
         Status: New

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wired network disabled in NetworkManager after resuming from suspend
https://bugs.launchpad.net/bugs/279986
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