Difference between revisions of "Grub 2 recovery"

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(Created page with " Back to Grub == Procedure 1 == Boot into Live CD Open Terminal (CTRL+ALT+T) Enter the following commands: sudo fdisk -l And find your Ubuntu partition sudo mount /de...")
 
 
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__NOTOC__
  
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<div class="thumbnail img-thumbnail">http://wiki.sc3.uis.edu.co/images/a/a8/Logo_sc33.png</div>
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<p><div class="btn btn-primary"><i class="fa  fa-long-arrow-left"></i> [[Grub]]</div></p>
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<div class="column clearfix">
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    <div class="col-md-14">
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        <div class="well well-midnight">
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            <h4>Grub 2 recovery</h4>
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        </div>
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    </div>
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</div>
  
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Back to [[Grub]]
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<div class="col-md-14">
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    <div class="panel panel-darker-white-border">
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        <div class="panel-heading">
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            <h3 class="panel-title">Procedure 1</h3>
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        </div>
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        <div class="panel-body">
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            <p>
  
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1. Boot into Live CD
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2. Enter the following commands: {{Command|<nowiki>sudo fdisk -l</nowiki>}}
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And find your Ubuntu partition
  
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== Procedure 1 ==
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3. Run the following commands:
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{{Command|<nowiki>sudo mount /dev/sda2 /mnt</nowiki>}}
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{{Command|<nowiki>sudo mount --bind /sys /mnt/sys</nowiki>}}
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{{Command|<nowiki>sudo mount --bind /proc /mnt/proc</nowiki>}}
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{{Command|<nowiki>sudo mount --bind /dev /mnt/dev</nowiki>}}
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{{Command|<nowiki>sudo chroot /mnt</nowiki>}}
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4. Now reinstall Grub2
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{{Command|<nowiki>grub-install --recheck /dev/sda</nowiki>}}
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{{Command|<nowiki>apt-get install --reinstall grub2</nowiki>}}
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5. Run as root
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{{Command|<nowiki>update-grub2</nowiki>}}
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since in the previous steps the grub list was created with an /dev/sda4 as an entry.
  
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Boot into Live CD
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            </p>
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Open Terminal (CTRL+ALT+T)
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        </div>
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Enter the following commands:
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    </div>
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sudo fdisk -l
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</div>
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And find your Ubuntu partition
 
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sudo mount /dev/sda2 /mnt
 
  
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sudo mount --bind /sys /mnt/sys
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<div class="col-md-14">
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    <div class="panel panel-darker-white-border">
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        <div class="panel-heading">
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            <h3 class="panel-title">Procedure 2</h3>
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        </div>
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        <div class="panel-body">
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            <p>
  
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sudo mount --bind /proc /mnt/proc
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These are the commands for managing Grub 2.
  
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sudo mount --bind /dev /mnt/dev
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1. Check the file /etc/default/grub and adjust the options accordingly
  
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sudo chroot /mnt
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2. Install grub2 in MBR
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Now reinstall Grub2
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{{Command|<nowiki>grub-install /dev/sda</nowiki>}}
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grub-install --recheck /dev/sda
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3. Auto-generate the boot menu for grub2:
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apt-get install --reinstall grub2
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{{Command|<nowiki>grub-mkconfig -o /boot/grub/grub.cfg</nowiki>}}
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4. Update the setup menu file:
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{{Command|<nowiki>update-grub</nowiki>}}
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5. For recovering a node in guane run:
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{{Command|<nowiki>grub-mkconfig -o /boot/grub/grub.cfg</nowiki>}}
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{{Command|<nowiki>grub-install /dev/sda</nowiki>}}
  
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            </p>
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Seguido, desde el nodo como root ejecute: update-grub2 ya que en los pasos anteriores se creaba en la lista de grub una opcion con /dev/sda4
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        </div>
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     </div>
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</div>
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== Procedure 2 ==
 
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Estos son los comandos para la gestión de grub2
 
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Archivo de configuración general
 
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    /etc/default/grub
 
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Instalar grub2 en el MBR
 
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    grub-install /dev/sda
 
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Generar automáticamente el archivo del menú de inicio del grub2
 
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    grub-mkconfig -o /boot/grub/grub.cfg
 
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Actualizar el archivo del menú de configuración
 
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     update-grub
 
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Para recuperar un guane se utiliza
 
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    grub-mkconfig -o /boot/grub/grub.cfg
 
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    grub-install /dev/sda
 

Latest revision as of 16:57, 9 April 2015


Logo_sc33.png

Grub

Grub 2 recovery

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


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