Recién recién actualicé el sistema que tengo actualmente en mi desktop via actualizaciones automáticas y algo raro pasó el instalador de Grub 2 me indicaba que se debía reinstalar y que yo debía seleccionar donde porque el ID del disco donde se instaló «anteriormetne» no era correcto. ete aquí el problema: la instalación del grub falló y si continua sin ello puede que su sistema no arranque adecuadamente…
Luego de instalar las actualizaciones, me pide reiniciar, lo cual realizo.¿Que pasó? Grub rescue> Osea el sistema no arranca porque grub no sabe donde ir a buscar el SO instalado en mi disco.
Esta y otras posibles causas nos pueden llevar a reinstalar el sistema de arranque de nuestro sistema, vamos a ello!
Primer paso:
Conseguir un live CD o instalar en un pendrive para arrancar en modo live un linux cualquiera
OJO (me pasó) si vamos a reparar un linux que está instalado en el disco y éste es 64 bits debemos instalar en el usb / CD un sistema con la misma arquitectura, sino tira algo como que el /bin/bash no es correcto.
Segundo paso: recuperar grub!
Montar la partición donde tenemos instalado el linux (sino estás seguro, consultar gparted)
Reemplazar XY, por la letra del dispositivo y el numero de la particion. Por ejemplo
Ahora vincular los sig directorios para que grub pueda detectar el SO instalado:
sudo mount --bind /dev/pts /mnt/dev/pts &&
sudo mount --bind /proc /mnt/proc &&
sudo mount --bind /sys /mnt/sys
Ahora «entrar» en el filesystem:
Ahora instalar grub, checkear y actualizar grub:
Con esto grub a sido reinstalado y recuperado, lo que queda es «salir» del filesystem y desmontar lo que vinculamos
sudo umount /mnt/sys
sudo umount /mnt/proc
sudo umount /mnt/dev/pts
sudo umount /mnt/dev
sudo umount /mnt
Reiniciar la maquina, y quitar lo que hayamos utilizado para iniciar la máquina: CD / usb
Listo!!
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