Cannot upgrade the bootloader because of a mismatch of the boot technology. The upgraded system uses Legacy BIOS boot while the installation medium has been booted using EFI boot.
This scenario is not supported, the upgraded system may not boot or the upgrade process can fail later.
No I didn’t. But I have solved the problem. The BIOS on this motherboard is incredibly complicated and the option to use legacy boot or UEFI had been set to both, and hidden with the Windows settings. Once I set it to legacy only, the error disappeared.
I am in Mexico, connected wirelessly with the ONE phone company available, and via cable with the ONE cable company available. Both have a tendency to go off line for extended periods sometimes simultaneously. I find it safer to download to my HD, then burn a DVD. Less disruption if the download fails.