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I installed Ubuntu alongside Windows 7 and everything worked well. But a problem arose where I had to reinstall Windows 7 so I did. But after the install, I am no longer able to boot into Ubuntu, there is no screen that allows any options, it loads directly into Windows 7.

Any solutions to solving this without having to re-install Ubuntu?

When I re-installed Windows 7, I was cautious enough to not install it accidentally on the Ubuntu partition and only install it on the Windows partition.

The Ubuntu partitions and swap area is still there so I believe I haven't lost anything, I'm just unable to boot into Ubuntu.

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You will need to run boot-repair to reinstall grub which is the boot screen that allows you to choose an OS to boot into. Please see the following similar question: How can I get GRUB to appear after installing Ubuntu with Windows 7 using a LiveUSB? –  Peachy Aug 5 '12 at 14:09
    
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2 Answers

If you have a Ubuntu Live CD , then start Live session .

In The Live session , open your terminal and type this

sudo add-apt-repository ppa:yannubuntu/boot-repair && sudo apt-get update

Give a Enter shot

and then type this

sudo apt-get install -y boot-repair && boot-repair

then it will open boot-repair as shown in image there select Recommended Repair Option . It will do the job of restoring your GRUB and then give a restart . remove your CD . There you go with your GRUB .

Source :https://help.ubuntu.com/community/Boot-Repair enter image description here

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The easiest way to resolve this problem is to boot your computer from a live Ubuntu CD or USB then install and run Boot Repair to reinstall grub and recover access to Ubuntu.
Have a look a the following link for instructions on installing and using boot repair.

Boot Repair

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