Difference between revisions of "Grub 2 recovery"
From Supercomputación y Cálculo Científico UIS
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| − | + | __NOTOC__ | |
| + | |||
| + | <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> | ||
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| + | <div class="col-md-14"> | ||
| + | <div class="panel panel-darker-white-border"> | ||
| + | <div class="panel-heading"> | ||
| + | <h3 class="panel-title">Procedure 1</h3> | ||
| + | </div> | ||
| + | <div class="panel-body"> | ||
| + | <p> | ||
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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 = | + | </p> |
| + | </div> | ||
| + | </div> | ||
| + | </div> | ||
| + | |||
| + | <div class="col-md-14"> | ||
| + | <div class="panel panel-darker-white-border"> | ||
| + | <div class="panel-heading"> | ||
| + | <h3 class="panel-title">Procedure 2</h3> | ||
| + | </div> | ||
| + | <div class="panel-body"> | ||
| + | <p> | ||
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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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| + | </p> | ||
| + | </div> | ||
| + | </div> | ||
| + | </div> | ||
Revision as of 16:46, 9 April 2015
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
