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I have an EFI based laptop with Windows 8 pre-installed. I wanted to install Ubuntu 12.04 in dual boot, started from the Windows boot manager.

I shrinked a Windows partition, booted Ubuntu from a USB and installed it in the empty space (seen then as /dev/sda8) freed up above. I specifically chose the boot partition to be on the same partition as Ubuntu (/dev/sda8).

My expectation was that I would reboot to Windows (since the boot loader was expected not to be touched) and then configure the Windows boot loader to look for Ubuntu.

Since I am typing this from Ubuntu you may have guessed that it did not go that way :)

Upon rebooting I have the Ubuntu boot manager

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but the Windows Boot Manager entry unfortunately does not work (the first picture is the left side of the screen, the second one - the right one):

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I hope that all the partitions are still there (looks so from gparted):

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It looks like from the error that the Linux boot manager does want to load the right partition (/dev/sda2).

I can use any of the boot managers, whatever works. How can I either recover the Windows boot manager and then configure it to boot the Linux partition, or have Windows boot from the Linux one?

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  • Get a windows 8 DVD of your edition and repair your system. After you repair you would only be able to boot into windows. After you log into windows 8 just change the boot menu from there via bcdedit (you can obtain the commands on internet just google it). I assume that boot menu only works from the previously installed OS.
    – Hunter
    May 11, 2014 at 14:52
  • Thank you for the information. I do not have a Windows 8 DVD, the system came pre-installed. Short of, hmmm, getting it anyway a way or another, is there a way to do the repair without the DVD (a rescue system built upon another Windows install for instance)?
    – WoJ
    May 11, 2014 at 15:01
  • Nope there isn't, only way to repair is with a windows 8 repair disc or windows 8 disc. There isn't any way that doesn't require a installation disc. Also if you hadn't installed ubuntu over windows there might be a way to get the repair menu. You can try pressing F8 as soon as the computer starts (flash screen) and then get the repair menu.
    – Hunter
    May 11, 2014 at 15:08
  • See this question and answer on askubuntu.com. Concerning Hunter's declaration that it can't be done, this is an example of Clarke's first law (although I make no claims about Hunter's age, profession, or reputation).
    – Rod Smith
    May 11, 2014 at 20:17

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