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> | ||
| − | |||
| − | |||
<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"> | ||
| − | |||
| − | |||
</div> | </div> | ||
</div> | </div> | ||
Revision as of 16:56, 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
