GRUB failure after upgrade from 8 to 9

I upgraded a laptop from Trisquel 8 to 9 and was left with a non-working grub. I tried fixing it by booting from a live Mageia CD I had, and following instructions I found online, which made a change but is still not booting.

After the upgrade, the next boot gave an error message "symbol 'grub_calloc' not found". After the failed fix I get a different error message, "file '/boot/grub/i386-pc/normal.mod' not found"

Is it possible to fix this? If so, how? I'm happy to provide additional information as needed.

Thanks!