After moving a Virtualbox VM drive to another host the network was not working...
ifconfig would only show the loopback.
> sudo ifconfig eth0 up
would return ERROR while getting interface flags: no such device.
> sudo lshw -class network
would return network disabled.
Had to do
> ifconfig eth0
eth0: error fetching interface information: Device not found
> ifconfig eth1
eth1: error fetching interface information: Device not found
> ifconfig eth3
eth2: Link encap: Ethernet HWaddr.....