I've never had any success with any grub repair tool. Recently I had to do a manual grub repair on a family member's machine after a Windows App under Wine screwed up the graphics and the OS I was working on booted without GRUB:
I've never had any success with any grub repair tool. Recently I had to do a manual grub repair on a family member's machine after a Windows App under Wine screwed up the graphics and the OS I was working on booted without GRUB: