As well as the OS already having been activated on delivery (which  is a red flag in of itself), the BIOS had already had secure boot master keys installed to the TPM module.  There was no way to remove the master key, so I did not have control of all aspects of the machine.  Attempts to remove the keys failed because I did not have access to the master key.As a result I was unable to disable secure boot and install Linux.  Working in software I have built dozens of machines from scratch, and installed OS's more times that I care to remember, and I have never seen this before.This is not a good buy.