Laptop BIOS no longer sees EFI partition

Hello,

On the laptop MSI GE72 6QF, I installed Ubuntu to an NVMe drive that came with it. Besides having to use acpi=off, it worked alright until trying to shut down. Plymouth continued forever, and minimizing it showed the repeated message "PCIe Bus Error: severityCorrected, type=Physical Layer, idx00e0 (Receiver ID)". Since then, the BIOS no longer recognizes any EFI partition on this drive, even though the drive still works once booted.

Is this a hardware issue? Has anyone experienced this?

Thanks in advance.

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Laptop BIOS no longer sees EFI partition