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Did you enable “Secure Boot “ in BIOS or TPM? Can you check that in BIOS and if enabled, try clearing or disabling?
Please share your findings.
Thanks for the hint, Secure boot was not enabled in either NUC, however re-flashing the bios has the RedHat workstation running again (no idea why this worked)
I will try the same solution on the Win7 OS box and report back.
Many thanks for your help,