Hello,
I just tried to install 18.01 from a USB stick, which worked fine, after that its not booting.
I have Supermicro X12SCZ-TLN4F with X550.
I allready tried to active CSM, but it tells me that it is somehow not suggest beause Intel does not support it (?).
Untill now I had this problem several times, but CSM switched on solved it.
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