($100 XMR BOUNTY) No bootable devices found after swapping SSD to new machine

if disabling secure boot didn’t work, try this, so UEFI loader has an easier time finding Qubes OS:

  1. stick your Qubes drive back into your old computer and boot
  2. open terminal in dom0 and run:
    sudo cp -r /boot/efi/EFI/qubes /boot/efi/EFI/BOOT
    sudo mv /boot/efi/EFI/BOOT/grubx64.efi /boot/efi/EFI/BOOT/BOOTX64.efi
  3. power off the old computer, stick the drive into the new one and try to boot

adapted from the accepted solution of [MSI PRO H610M-E DDR4] Cannot boot Qubes after a successful installation