Error: no such partition. Entering rescue mode

[George_Jiang]

Alright, I'm dual booting Windows 10 + 15.10. I was installing a Windows 10 update and left it there. I came back to see

Error: no such partition. Entering rescue mode...

I tried all of the solutions I got from googling, like typing in

ls (hd0,msdos1)/
ls (hd0,msdos1)/boot
ls (hd0,msdos2)/
ls (hd0,msdos1)/boot
etc. but none of that worked. So I booted Ubuntu from a live usb and I tried the boot repair. It didn't solve the problem, I was getting the same error upon restarting. Here is the paste log, if that is still important though: http://paste.ubuntu.com/14156248/

(http://paste.ubuntu.com/14156248/)Here's the thing though, I launched GParted to check my hard drive, and it seems like my Ubuntu partition has turned into unallocated space, and there is also another empty partition with 2mb of unallocated space. Here is a screenshot:
http://i.imgur.com/bBZHiZg.png

So I think what happened is that grub got deleted, and now I can't boot from it. Can someone help me with this? I don't even care about my lost Ubuntu partition anymore, I just want to get my computer working...

Thank you in advance!

Edit: My idea is that I should try reinstalling Ubuntu, and see what happens. Worst case scenario I wipe my disk.

[George_Jiang]

Ok, I fixed it by reinstalling Ubuntu where it was, and it installed grub right where it belonged too. Everything works as normal now.

[MAFoElffen]

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