archlinux grub

parted flag

For parted set/activate the flag bios_grub on the partition.

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parted -a optimal /dev/sda
    set 1 bios_grub on

pacman -S grub
# where /dev/sdX is the disk (not a partition)
grub-install --target=i386-pc /dev/sdX

grub-mkconfig -o /boot/grub/grub.cfg

### exit arch-chroot
exit

# 重启
reboot