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I found a fix. When you run "dmesg | grep eth" you can see that the clones are colliding with the old instance of the card from the base machine...
I just straight cloned my base image and the same behavior happened so this is not simply a Linked Clone issue.
I can confirm this is happening for me as well. I just tried to take a working Ubuntu 14.04 server image, which I just setup, and create a linked...