>mv: failed to preserve ownership for ���/boot/efi/EFI/opensuse/grub.efi���: Operation not permitted
It should be okay to ignore that message. It would have been better to use
"cp" instead of "mv", and then you would not get the message.
What happened there, is that the EFI partition uses the FAT file system, which
does not support the unix idea of file owner.