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I have install Windows 8.1 and Ubuntu 14.04 on my PC. But when I am turning on my computer, ubuntu boots automatically and i can not boot windows.

What can I do about it?

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Open a terminal and run sudo fdisk -l and edit your question with the results. – To Do Jun 19 '14 at 16:44
Try this solution here You have to fix the GRUB – OdinRW Jun 19 '14 at 18:47
up vote 1 down vote accepted

Press and hold shift as you see the BIOS screen until you get a list of bootable Operating Systems. If Windows isn't there, you have probably accidentally removed it...

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try running osprober see if it detects your windows. Also while installing did go into your bios and disabled fast boot or secure boot. Might be a UEFI issue.

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