FREE LOOK

  Here is an ultimate solution for all boot errors and GRUB errors in Ubuntu Linux after reinstalling windows along with Linux. All that you have to do is insert a live CD or bootable USB and go into Ubuntu live session.

  Open a terminal in the live session and enter the following commands:



If your internet connection has proxy apply proxy settings from this post.  (Please dont restart after applying all proxy settings.)



This will install boot-repair software in the live environment. Now type in the terminal







Now click on "Recommended repair"

This will resolve all the grub and boot related issues...

For further details:

http://sourceforge.net/p/boot-repair/home/Home/

https://help.ubuntu.com/community/Boot-Repair



Cheers,
SANJEEV