Difference between revisions of "Grub 2 recovery"
From Supercomputación y Cálculo Científico UIS
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== Procedure 1 == | == Procedure 1 == | ||
1. Boot into Live CD | 1. Boot into Live CD | ||
| − | 2. Enter the following commands: {{Command|<nowiki>sudo fdisk -l</nowiki>}} And find your Ubuntu partition | + | 2. Enter the following commands: {{Command|<nowiki>sudo fdisk -l</nowiki>}} |
| + | And find your Ubuntu partition | ||
3. Run the following commands: | 3. Run the following commands: | ||
{{Command|<nowiki>sudo mount /dev/sda2 /mnt</nowiki>}} | {{Command|<nowiki>sudo mount /dev/sda2 /mnt</nowiki>}} | ||
Revision as of 23:15, 11 October 2014
Back to Grub
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
