as bastions memory when installing win after linux
Boot with gparted live cd.
fdisk-l to find the device where you installed grub
grub (enter)
find / boot/grub/stage1
root (hd0, 0) where the second 0 indicates the device decreased by 1, ie if / dev / sda5, put (hd0, 4)
setup (hd0) quit
