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few days ago, I was updating my ubuntu from 12.10, to 13.04, but unfortunately my PC did turn off with no reason (I actually had problems with that by lasted days, but it doesn't matter) and now, when I loaded ubuntu and logged in, I had clear desktop, couldn't do anything. So I downloaded installer and booted it with USB and I have a problem...

There is no option such as "update existing Ubuntu partition", only "Install next to Windows 7", "Install instead Windows 7" and "Use another option". And my question is... how do I update my ubuntu? I have my really, really needed stuff in there (CMS that I were working on by 2 months).

Is there any option, so I will install ubuntu without loosing my files?

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It seems that your Ubuntu system is now corrupt.

You should delete all the Ubuntu partitions (do a backup of your important files) and install Ubuntu 13.04 in a new partition.

You can find more information to accomplish this on this site:

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How about installing Ubuntu instead of Win7, and then copy these files? Coz I even have a error with grub while loading the PC, and I can not choose any of OS. :P Will it work? I mean, will I have a access to other ext4 partitions? – Patryk May 17 '13 at 23:31
You should first do a backup of your files, then install Ubuntu. When you finish to install Ubuntu, the boot loader should be working fine. If it doesn't, take a look at this post – Lucio May 17 '13 at 23:32

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