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I have a Lenovo Y510P laptop and managed to get Windows 8 and Ubuntu 13.10 dual booting. But then after grub was updated, I had to run boot-repair and now I can't boot into Windows.

When the computer starts and grub shows, I can boot into Ubuntu without a problem, but if I choose Windows from the boot menu, it just goes back to the menu.

I don't really know what kind of information I should provide, so please let me know if anything else besides what I posted bellow is needed.

My bios boot configuration is the following:

  • Boot type: UEFI
  • Secure boot: Disabled

Here is my grub.cfg file: http://paste.ubuntu.com/6501866/

Here is my boot info from boot-repair: http://paste.ubuntu.com/6501878/

Marjan
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  • change boot mode from UEFI to legacy mode in bios.Then ran boot-repair. – Avinash Raj Dec 01 '13 at 00:34
  • Is that the only way? It used to work in UEFI mode before. – Marjan Dec 01 '13 at 16:08
  • I bought lenovo laptop z500 with preinstalled windows8 os in UEFI mode,then i change UEFI mode to legacy mode in bios.And now i had four os's in my laptop.(windows8,windows8.1,ubuntu 13.04,ubuntu 13.10) – Avinash Raj Dec 01 '13 at 16:12
  • I switched to legacy mode. Now when I run boot-repair I get this: "EFI detected. Please check the options." I click OK, and then I click Recommended repair, and I get this:

    "GPT detected. Please create a BIOS-Boot partition (>1MB, unformatted filesystem, bios_grub flag). This can be performed via tools such as Gparted. Then try again. Alternatively, you can retry after activating the [Separate /boot/efi partition:] option."

     – Marjan Dec 01 '13 at 18:40
  • which errors you get? – Avinash Raj Dec 01 '13 at 18:46
  • I'm getting the two messages posted in my previous comment. After I click OK on the second message, I'm back at the boot-repair window. – Marjan Dec 01 '13 at 18:56
  • Please run boot-repair in UEFI-mode. Maybe best to disable CSM in UEFI-settings so you can boot only in UEFI-mode and avoid this kind of confusion. – mook765 Oct 17 '18 at 20:59

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