Comment 4 for bug 512633

The NC additional preseed (downloaded from the CC) contains the CC host eucalyptus public key, which is generated at CC host install time. So your preseed would probably miss that.

Could you explain the use case for installing, with the UEC installer, a NC in a cloud without CC ? You'd be better off doing a regular server install and choose the cloud node task, if you want to bypass what eucalyptus-udeb does completely.