For whatever reason, dnf update eventually worked ( another self-healed cure ? )

Anyways, here are two errors:

      Upgrading        : grub2-efi-x64-1:2.06~rc1-3.fc35.x86_64                                                 159/498
                               warning: /boot/grub2/grubenv created as /boot/grub2/grubenv.rpmnew

       Upgrading        : grub2-efi-x64-1:2.06~rc1-3.fc35.x86_64                                                 159/498
                                 warning: /boot/grub2/grubenv created as /boot/grub2/grubenv.rpmnew

250 packages updated.

Is it safe to re-start, or should I leave the computer on and do another update tomorrow ?

That was likely the largest wi-fi update I have ever done.      I used to have a reliable access to ethernet

before the COVID hysteria.

David Locklear