More detail on the help above:

1.  Boot with LiveCD
2.  Open terminal
3.  sudo fdisk -l (boot partition may be the one with the asterisk)
4.  sudo mkdir /media/root
5.  sudo mount /dev/sdaX /media/root, where X is your mount partition (often 
the one with an asterisk in step 3 above).  Otherwise, try all the others.
6.  mount /dev/sdaX /media/root/boot
7.  Check boot by running ls /media/root/boot.  If the mount is correct, you 
will see files like vmlinuz and memtest
8.  sudo grub-install --root-directory=/media/root /dev/sda --recheck

If all is good, you should get:

Installation finished. No error reported.
This is the contents of the device map /boot/grub/device.map.
Check if this is correct or not. If any of the lines is incorrect,
fix it and re-run the script `grub-install'.

(hd0)   /dev/sda

-- 
Grub loading. The symbol ' ' not found. Aborted. Press any key...
https://bugs.launchpad.net/bugs/482757
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