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I have a PC with Windows 7 Ultimate and Ubuntu 10.04 with GRUB as boot manager.

Now I would like to install Ubuntu 12.10 along with these operating systems. I prefer Wubi, as it seems easy to install Ubuntu without harming the other OS.

Do I need to back up all my files? Or can I switch to the new version of Ubuntu/Windows 7/Ubuntu 10.04 from GRUB?

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Do I need to back up all my files?

No need to backup files.

Or can I switch to the new version of Ubuntu/Windows 7/Ubuntu 10.04 from GRUB?

Yes, you can. The GRUB menu lists your old OS for booting like this:

What are the possible problems? Sometimes Ubuntu might not appear in your boot menu.

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