I attempted to install Ubuntu 13.04 with Windows 7 64 bit on an HP DV7t-7000 notebook. The Ubuntu installer was unable to identify the existing Windows installation. I have two hard drives installed and I think it did not even see the first one possibly because it is GUID and the notebook is using UEFI.

marked as duplicate by Warren Hill, Mitch, Luis Alvarado Aug 8 '13 at 10:18

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I had similar issue which I fixed with boot-repiar:

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

I have Ubuntu Raring + Windows8 both working fine.

Good luck.

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