Repair Grub

（亲测是可以解决问题的!）

Assumptions

Your Ubuntu is installed in /dev/sda1 (If you are not sure, type:)



gparted # OR # sudo fdisk -l



[edit]Steps

1. Boot with Ubuntu LiveCD or LiveUSB
2. Open Terminal
3. Mount Root partition



sudo mount /dev/sda1 /mnt



4. Mount System mount points



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



5. Change Root



sudo chroot /mnt



6. Install



grub-install /dev/sda grub-install --recheck /dev/sda update-grub



7. Un-mount



exit && sudo umount /mnt/dev && sudo umount /mnt/dev/pts && sudo umount /mnt/proc && sudo umount /mnt/sys && sudo umount /mnt



8. Finish and Restart

[edit]