Reparar GRUB al instalar Windows después de Ubuntu

Cuando tenemos varios sistemas operativos en una misma máquina, típicamente seleccionamos cuál cargar al arrancar usando GRUB. El tema es que instalar Windows, cosa muy frecuente, se lleva puesto el GRUB. Rescatarlo es fácil, pero siempre tengo que buscarlo de nuevo así que voy a poner esta guía acá:

Fix GRUB after Windows Install

De más está decirlo, pero todo el crédito es para Scott Calonico y los creadores de SuperGRUB

¡Ojo! Desde su versión 9.10, Ubuntu usa Grub2, que es bastante diferente a su antecesor. En todo caso, SuperGRUBDisk tiene una versión para GRUB2, pero según ellos no funciona del todo bien. En ese caso, pelamos el Live CD de Ubuntu, arrancamos desde él, abrimos una terminal y hacemos: 

sudo update-grub
sudo fdisk -l
sudo grub-install /dev/sdx

Donde reemplazamos la "x" de "sdx" por la letra correspondiente al disco duro en cuyo MBR queremos reinstalar GRUB (para eso usamos el comando fdisk, para ver las particiones)

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