-
# Boot on a live CD and open a console. sda1 is supposed to be the partition containing the OS
-
# 1/ Restore GRUB
-
mount -t proc none /dev/sda1/proc
-
mount -o bind /dev /dev/sda1/dev
-
chroot /dev/sda1/ /bin/bash
-
/usr/sbin/grub
-
grub > root(hd0,0) # 0->a, 1->b … #1->0, 2->1 …
-
grub > setup(hd0)
-
grub > quit
-
# 2/ Check if partition is bootable
-
fdsik /dev/sda
-
fdisk > p # print the partition table
-
fdisk > a # toggle a bootable flag
-
fdsik > 1
-
fidsk > w
-
# 3/ Reboot !! That’s done