Difference between revisions of "Grub 2 recovery"

From Supercomputación y Cálculo Científico UIS
Line 3: Line 3:
 
<div class="thumbnail img-thumbnail">http://wiki.sc3.uis.edu.co/images/a/a8/Logo_sc33.png</div>  
 
<div class="thumbnail img-thumbnail">http://wiki.sc3.uis.edu.co/images/a/a8/Logo_sc33.png</div>  
 
<p><div class="btn btn-primary"><i class="fa  fa-long-arrow-left"></i> [[Grub]]</div></p>
 
<p><div class="btn btn-primary"><i class="fa  fa-long-arrow-left"></i> [[Grub]]</div></p>
 
<p><div class="btn btn-primary"><i class="fa  fa-long-arrow-left"></i> [[Wiki SC3]]</div></p>
 
 
<div class="column clearfix">
 
<div class="column clearfix">
 
     <div class="col-md-14">
 
     <div class="col-md-14">
 
         <div class="well well-midnight">
 
         <div class="well well-midnight">
            <h4>Administración</h4>
 
            <p class="bs">En esta sección encontrará todos los procedimientos de Instalación y Configuración del Hardware y Software del SC3</p>
 
 
         </div>
 
         </div>
 
     </div>
 
     </div>

Revision as of 11:56, 9 April 2015


Logo_sc33.png

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