Scenario: You have a box running Ubuntu Server. Something happens to the box and you decide to move the hard-drive to another physical machine to get the server back up and running. The hardware is identical on the other machine, so there shouldn’t be any issues at all, right?

The machine starts up fine, but when you try and hit the network, you can’t. Closer inspection using the ifconfig command reveals that there is no “eth0″ adapter configured. Why?

Here’s how to fix it.

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