The commands to fix it are:
sudo pacman -Syu sudo pacman -S grub-tools sudo pacman -S grub os-prober sudo grub-mkconfig -o /boot/grub/grub.cfg reboot
The commands to fix it are:
sudo pacman -Syu sudo pacman -S grub-tools sudo pacman -S grub os-prober sudo grub-mkconfig -o /boot/grub/grub.cfg reboot