Ubuntu system corrupted

[Hari]

Hello All,​


  I have a dual boot - Ubuntu and windows 7. I recently wass playing around
in the ubuntu and used the 'dd' command and it kinda corrupted my linux
file system. I exactly dont know what happened to Linux now. All my data is
missing. I did the boot-repair and now the grub is removed and it is
directly booting to windows. Please help me recover all my data in ubuntu.
It is very important. Please help me with the process. I am desperate!!

Here is the pastebin link containing the logs.

paste.ubuntu.com/11395840/

Thanks in advance
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