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Thread: Win10 dual boot with Leap 15.1. Were to install grub so win10 will not overwrite grub2?

  1. #1
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    Default Win10 dual boot with Leap 15.1. Were to install grub so win10 will not overwrite grub2?

    Hello

    Installed win10 first and after that OpenSuse Leap 15.1.
    Boot Secure is disabled. Disk is initialized as GPT
    First I've installed grub with defaults and result in an own efi boot partition and win10 was not found.
    After searching I've found that you must install in win10 efi boot partition...
    This worked fine, but after starting one time win10 my grub is overwritten with win10 boot manager or
    is this a problem of fast boot of win 10?
    I've also noticed that win make 2 efi-boot partition. Which one should be used? The first one (before system partition) of the one after?

    Any infos?

    BTW: How can I boot my already installed leap 15.1 with the leap rescue cd if I know the root partition?

  2. #2
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    Default Re: Win10 dual boot with Leap 15.1. Were to install grub so win10 will not overwrite grub2?

    Installing with its own EFI partition should have worked. That's what I have here with Windows 8.1.

    Using the Windows EFI partition should also work, unless you have a BIOS that doesn't like it. Note that I do have such a BIOS here. If I use the same EFI partition for both Windows and openSUSE, then when I boot Windows, the openSUSE boot entry is deleted. If I use different EFI partitions they both stay and everything works.

    However, some people have reported that there is no Windows boot entry after installing openSUSE. But running
    Code:
    grub2-mkconfig -o /boot/grub2/grub.cfg
    usually fixes that. (You have to run that command as root).

    If you boot from the installer CD or perhaps the rescue CD, there is probably a menu choice to "boot from hard drive". That should boot your system.

    Can you post the output from:
    Code:
    efibootmgr -v
    You can run that from the rescue CD. Or you can run that from your system if you get it booted.

    For EFI booting, Windows does not overwrite grub. But your BIOS might delete the boot entry.
    openSUSE Leap 15.1; KDE Plasma 5;
    testing Leap 15.2Alpha

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