My Laptop was working just fine a day back but it started show the following error on booting:

error: couldn't read file

So, I googled about it and used a Live-CD to use Boot-Repair as told here: "can't read file" error after installation causes system to not boot

I was given this link: http://paste.ubuntu.com/1441528/ if there are issues still.

I also tried to do it again by a Boot-Repair-Disk this time and now I am getting the following error:

error: couldn't read file
error: you need to load the kernel first

The boot-repair-disk gave me this link: http://paste2.org/p/2609703 if there are further issues.