Why would an Ubuntu system (16.04 LTS) that boots just fine on one system board refuse to boot on another?

The drive in question has an EFI boot sector, and I suspect this has something to do with the problem, but both boards support UEFI and I've tried it in UEFI and legacy mode.

@woozle Hi Woozle! Have you had this question answered yet? I'm just curious.


@cat_tharsis I've been given lots of documentation with which I might be able to figure out the answer, but haven't had time to pursue it... and I unfortunately needed the server back online sooner rather than later, so I moved back to the old one for now :-/

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