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I installed Ubuntu 12.04 version using WUBI when my laptop was running windows 7 which I upgraded to windows 8.1 preview.

Everything was working well until I upgraded again to windows 8.1 retail when it was released a few weeks ago.

After selecting Ubuntu during boot option, boot manager showed the below error message.

The os couldn't be loaded because the file \Ubuntu\winboot\wubildr.mbr is missing or contains error 

I have tried the Boot-Repair option twice now and chkdsk /r /f /x (every option that is supposed to fix errors) but to no avail. Please help me because my thesis is on there and stupidly enough, nowhere else.

Here is the link from my Boot-Repair procedure.

http://paste.ubuntu.com/6380961/

How to fix this?

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Pull your thesis off from Windows: how-to-read-ext4-partitions-in-windows –  bcbc Nov 8 '13 at 18:19
    
I can't see any Wubi files from your boot repair. Are you sure it didn't wipe the \ubuntu directory when you upgraded your Windows? This is probably why you're getting the wubildr.mbr error, because it doesn't exist anymore (along with the root.disk too) –  bcbc Nov 8 '13 at 18:24
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