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I formatted all of my disk and installed Ubuntu on my computer. I immediately partitioned, from an Ubuntu live CD, my hard drive, creating an NTFS partition for for Windows. After successfully doing so, I went on to install windows 8.1. After I installed Windows 8 in the new partition and turned off my PC and turned it on again the option to chose which Operating system I wanted to use didn't appear, loading Windows like if Ubuntu didn't exist.

How can I have the option to chose which operating system I want to run or at least from which partition to boot from when I start my computer?

EVERYTHING IS OKAY WITH MY OPERATING SYSTEM

The only thing I need is for ubuntu to appear as an option on the boot menus

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If you're using UEFI you should be able to choose the boot menu entry from the BIOS boot menu. –  FSMaxB Nov 6 '13 at 13:46
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3 Answers 3

Download boot repair disk from here .Make the disk bootable through usb using the software unetbootin on windows.Once the disk booted up click on the recommended repair option.It update and reinstall the grub.now you have two os's on the boot menu.

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Well, I do boot from my disk, I boot windows 8.1 from my disk. The problem is that I can't see the ubuntu option when loading. It loads windows automatically without asking me –  Christian Galo Nov 5 '13 at 3:08
    
If I install GRUB, will it appear at the beginning after the BIOS to make me choose an operating system? –  Christian Galo Nov 5 '13 at 3:12
    
yes,if you install grub,it will appears at the begining and make you to choose the operating system.Did you able to boot into windows?Then you can try EasyBCD.Download and install easybcd on your windows,under linux tab make entry for your ubuntu partition and also create entry for your windows partition.It would help you. –  Avinash Raj Nov 5 '13 at 4:00
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1st. Make sure that ubuntu still exists on your hard drive. It is a very very common mistake to overwrite the existing partition when installing a newer one.

If thats not the case , you can use Avinash's advice and try recovering/repairing the OS.

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  1. boot your ubuntu live cd
  2. try ubuntu
  3. connect to internet
  4. run on terminal

sudo add-apt-repository ppa:yannubuntu/boot-repair

sudo apt-get update

sudo apt-get install -y boot-repair

boot-repair

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