Why can't I boot into Ubuntu installed alongside Windows 8?

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http://askubuntu.com – Once I reboot it after the installation, it brings me to a screen to choose Windows 8 or Ubuntu. When I click Ubuntu it brings me to a screen with this options: Reinstall windows Change the language or Repair And then it brings me back to the GRUB, and then if I pick Ubuntu it does it again. (HowTos)