Difference between revisions of "Grub 2 recovery"

From Supercomputación y Cálculo Científico UIS
(Translation)
Line 3: Line 3:
 
== Procedure 1 ==
 
== Procedure 1 ==
 
1. Boot into Live CD  
 
1. Boot into Live CD  
2. Enter the following commands: {{Command|<nowiki>sudo fdisk -l</nowiki>}} And find your Ubuntu partition  
+
2. Enter the following commands: {{Command|<nowiki>sudo fdisk -l</nowiki>}}  
 +
And find your Ubuntu partition  
 
3. Run the following commands:
 
3. Run the following commands:
 
{{Command|<nowiki>sudo mount /dev/sda2 /mnt</nowiki>}}
 
{{Command|<nowiki>sudo mount /dev/sda2 /mnt</nowiki>}}

Revision as of 23:15, 11 October 2014

Back to Grub

Procedure 1

1. Boot into Live CD

2. Enter the following commands:

sudo fdisk -l

And find your Ubuntu partition 3. Run the following commands:

sudo mount /dev/sda2 /mnt
sudo mount --bind /sys /mnt/sys
sudo mount --bind /proc /mnt/proc
sudo mount --bind /dev /mnt/dev
sudo chroot /mnt

4. Now reinstall Grub2

grub-install --recheck /dev/sda
apt-get install --reinstall grub2

5. Run as root

update-grub2

since in the previous steps the grub list was created with an /dev/sda4 as an entry.

Procedure 2

These are the commands for managing Grub 2.

1. Check the file /etc/default/grub and adjust the options accordingly

2. Install grub2 in MBR

grub-install /dev/sda

3. Auto-generate the boot menu for grub2:

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

4. Update the setup menu file:

update-grub

5. For recovering a node in guane run:

grub-mkconfig -o /boot/grub/grub.cfg
grub-install /dev/sda