Reboot to black screen 'reboot and select proper boot device', cant reinstall GRUB

I’m guessing failed to prepare your disk properly for a UEFI installation; guessing because insufficient information was provided to form an accurate assessment.

A UEFI installation is presumed, being that this has been the default for at least the last decade. In future, please indicate in your first post that you have a Legacy/MBR based installation.

And if that time comes, perhaps your own attitude will be reflected back at you, which naturally will not be very productive.

Topic will now be closed.