Boot Manager

1. Install packages: pacman -S grub os-prober efibootmgr
   • Omit efibootmgr if you have a BIOS system
2. Install boot loader: grub-install --target=x86_64-efi --efi-directory=/boot --bootloader-id=grub
3. Make boot loader config: grub-mkconfig -o /boot/grub/grub.cfg