Original Poster Posted July 1, 2014 Share Posted July 1, 2014 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? Link to comment Share on other sites More sharing options...
Haggis Veteran Posted July 1, 2014 Veteran Share Posted July 1, 2014 here you go http://howtoubuntu.org/how-to-repair-restore-reinstall-grub-2-with-a-ubuntu-live-cd 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. Link to comment Share on other sites More sharing options...
Original Poster Posted July 1, 2014 Author Share Posted July 1, 2014 here you go http://howtoubuntu.org/how-to-repair-restore-reinstall-grub-2-with-a-ubuntu-live-cd 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. life saver, thank you. worked great Link to comment Share on other sites More sharing options...
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