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Thread: Make Grub work after Windows 10 installation

  1. #1

    Default Make Grub work after Windows 10 installation

    Hi, all!
    I've my work's notebook (with UEFI).
    I installed openSuse Leap 42.1, and after a little work with some drivers, all is working very well.
    Now, my boss want to install Windows 10 on a partition that I left free.
    I know, when I install Windows after Linux, Grub stop working.
    Is there any simple way in order to Grub start working again for dual boot?
    Or,
    Is there any way to install only Grub?
    Or maybe,
    Is there any way to boot openSuse (after Windows 10 installation), in order to reconfigure Grub?

    (I want to know the process before to install Windows 10.)

    Thank you in, advance.
    [Adrián E. Córdoba]

  2. #2
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    Default Re: Make Grub work after Windows 10 installation

    Well it should not be a problem if you use EFI boot. Windows should just be added to the EFI boot partition. Problem is Windows may decide to erase the EFI boot leaving openSUSE out in the cold. I suggest you backup the directories and files in the EFI boot to an external device just in case Windows decides to be nasty

  3. #3

    Default Re: Make Grub work after Windows 10 installation

    Quote Originally Posted by gogalthorp View Post
    Well it should not be a problem if you use EFI boot. Windows should just be added to the EFI boot partition. Problem is Windows may decide to erase the EFI boot leaving openSUSE out in the cold. I suggest you backup the directories and files in the EFI boot to an external device just in case Windows decides to be nasty
    Thank you, for reply.
    I understood.
    But just in case Windows erase the EFI boot,... Is there any way to install Grub again?
    (Its just curiosity... I have a PC with BIOS - no EFI -, running openSuse 13.2.)
    [Adrián E. Córdoba]

  4. #4
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    Default Re: Make Grub work after Windows 10 installation

    Back up current contents of the partition as files so you can copy back. no reinstall should be need unless the the settings in the UEFI flash are messed with. Be sure you have a live repair disk and you can correct any changes if need be

    This is not like a MBR boot it is totally different

    Problem is that you never know what a Windows install will do. If they follow the correct UEFI rules it should be fine but they can throw a monkey wrench since they simply don't care if they follow standards

  5. #5
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    Default Re: Make Grub work after Windows 10 installation

    Quote Originally Posted by aecordoba View Post
    Thank you, for reply.
    I understood.
    But just in case Windows erase the EFI boot,... Is there any way to install Grub again?
    (Its just curiosity... I have a PC with BIOS - no EFI -, running openSuse 13.2.)
    This is an unlikely problem.

    If it does happen, check whether there is still a directory "\EFI\opensuse" in the EFI partition. The chances are that it will still be there. And, if it is still there, you should be able to run "efibootmgr" to add an entry for opensuse. Use google for examples.

    To do this, you have to boot your rescue media to UEFI mode -- otherwise "efibootmgr" won't work.

    If the EFI partition has been reformatted, you could go to full rescue mode and run
    Code:
    # grub2-install --target=x86_64-efi
    although it is unlikely that this will be needed.
    opensuse Leap 42.3; KDE Plasma 5;
    opensuse tumbleweed; KDE Plasma 5 (test system);

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