I just installed a debian linux onto a box (i currently have no internet for it as i type this), then something went wrong on the install with the grub and it failed to install the loader... i have a live ubuntu USB I was wondering if anyone could tell me how to fix the MBR?
Best Answer Haggis , 01 July 2014 - 20:47
here you go
Mount the partition your Ubuntu Installation is on. If you are not sure which it is, launch GParted (included in the Live CD) and find out. It is usually a EXT4 Partition. Replace the XY with the drive letter, and partition number, for example: sudo mount /dev/sda1 /mnt.
sudo mount /dev/sdXY /mnt
Now bind the directories that grub needs access to to detect other operating systems, like so.
sudo mount --bind /dev /mnt/dev && sudo mount --bind /dev/pts /mnt/dev/pts && sudo mount --bind /proc /mnt/proc && sudo mount --bind /sys /mnt/sys
Now we jump into that using chroot.
sudo chroot /mnt
Now install, check, and update grub.
This time you only need to add the drive letter (usually a) to replace X, for example: grub-install /dev/sda, grub-install –recheck /dev/sda.
grub-install /dev/sdX grub-install --recheck /dev/sdX update-grub
Now grub is back, all that is left is to exit the chrooted system and unmount everything.
exit && sudo umount /mnt/sys && sudo umount /mnt/proc && sudo umount /mnt/dev/pts && sudo umount /mnt/dev && sudo umount /mnt
Shut down and turn your computer back on, and you will be met with the default Grub2 screen.Go to the full post