This one worked for me and it was so easy. I had a power outage, and once the power came back on, I got the 'grub_disk_native_sectors' error on boot.
Followed your instructions and we're back in business. Thank you !!!
Both of my home lab Proxmox servers encountered this 'grub_disk_native_sectors' error when I had to start them up after an extended shutdown (new flooring so had to disassemble the home lab).
Both of these had been upgraded from 7 to 8 in the...