ERROR: interface eth0 does not exist
you will get this error if you cloned the active-raspberry pi with existing ethernet device,
why this occurred? wkwkwk its pretty easy, when you move the whole system into the new card and new device, your mac-address change right?, this will be ignored by the cloned system and left it unconfigured.
so, to solve this, just remove the persistent rules as follow :
# rm -fr /etc/udev/rules.d/70-persistent-net.rules
and then reboot the system
its suppose to be ok. Sips, tengkyu……..