I use Ubuntu, and often bonk up my GRUB after reloading Windows.   It’s easy to fix.  here’s what works on my partition layout… your mileage may vary sudo grub grub> root (hd0,2) grub> setup (hd0) Checking if “/boot/grub/stage1” exists… yes Checking if “/boot/grub/stage2” exists… yes Checking if “/boot/grub/e2fs_stage1_5” exists…...