_CFGetHostUUIDString: unable to determine UUID for host, is a common thing on OSX. It is a message in log caused by kernel when system doesn't find ethernet adapter as built-in. Can be fixed via IOnetworkingfix but the best way is to fix it by making ethernet, LAN as 'built-in' via DSDT. Try to search a bit how to do this. It has no side effects apart from logs, on your networking, internet speed for example and so on. (or at least i just think it doesn't have). But it is good to fix it and have as perfect system as possible.

Regards.

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