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How do I set up a dual boot Windows and Ubuntu?

I installed Ubuntu 10.10 alongside Windows 7. I was able to upgrade to version 11.04. Now I'm trying to update to version 11.10 but I get an error message saying it is not possible to upgrade.

I decided to install a partition, but when I start the PC I don't get a grub screen that lets me choose which OS to boot. I formatted the partition where I installed Ubuntu, I've been looking for tutorials where you learn how to install Ubuntu on a partition part to try to understand the problem.

I wonder if anyone can explain how to install Ubuntu on a partition an existing partition, so that when I boot the PC I see the grub menu that lets me choose which system I want to start.

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marked as duplicate by jokerdino, izx, Eliah Kagan, Jorge Castro, Mitch Aug 24 '12 at 5:39

This question was marked as an exact duplicate of an existing question.

Go for fresh install of ubuntu 11.11 if you want. – shantanu Apr 8 '12 at 17:45

Use Wubi, or, on the installer, select to install alongside Windows 7.

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