Difference between revisions of "Grub 2 recovery"

From Supercomputación y Cálculo Científico UIS
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Back to [[Grub]]
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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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            <h3 class="panel-title">Procedure 1</h3>
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== Procedure 1 ==
 
 
1. Boot into Live CD  
 
1. Boot into Live CD  
 
2. Enter the following commands: {{Command|<nowiki>sudo fdisk -l</nowiki>}}  
 
2. Enter the following commands: {{Command|<nowiki>sudo fdisk -l</nowiki>}}  
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since in the previous steps the grub list was created with an /dev/sda4 as an entry.
 
since in the previous steps the grub list was created with an /dev/sda4 as an entry.
  
== Procedure 2 ==
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    <div class="panel panel-darker-white-border">
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            <h3 class="panel-title">Procedure 2</h3>
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These are the commands for managing Grub 2.
 
These are the commands for managing Grub 2.
  
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{{Command|<nowiki>grub-mkconfig -o /boot/grub/grub.cfg</nowiki>}}
 
{{Command|<nowiki>grub-mkconfig -o /boot/grub/grub.cfg</nowiki>}}
 
{{Command|<nowiki>grub-install /dev/sda</nowiki>}}
 
{{Command|<nowiki>grub-install /dev/sda</nowiki>}}
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Revision as of 11:46, 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