Bringing back the Windows 10 option in the dual-boot menu

  1. Posts : 1
    Windows 10

    Bringing back the Windows 10 option in the dual-boot menu

    I have a problem. I have installed Debian 10 on my computer as second OS next to my Win 10. After this the Debian was my default system to boot into, but I wanted my Windows as default, so I went on and made some modifications after tutorials that I can't remember, and now I couldn't boot into my windows. It disappeared from the bootloader (GRUB). Thanks for the help in advance! :)
      My ComputerSystem Spec

  2. Posts : 62
    Windows 10 Home 64-bit

    So you cannot boot-up the computer? Is this correct? If so then did you create a backup image and bootable USB rescue stick before doing these changes?
      My ComputerSystem Spec

  3. Posts : 851
    10 +Linux

    Welcome to the Ten forum!
    sudo update-grub
      My ComputerSystem Spec

  4. Megahertz's Avatar
    Posts : 408
    Windows 7 HP 64 - Windows 10 Pro - Lubuntu

    MikeMecanic said: View Post
    Welcome to the Ten forum!
    sudo update-grub
    When you run sudo update-grub cmd under linux it will find the windows OS and add an option in grub boot loader to boot windows.

    As your computer is new I would say you have a UEFI BIOS, and both, Windows and Linux boot loaders, should on the Fat32 partition.
    If you haven't screw up, you will find Windows boot loader and Linux boot loader on BIOS Boot priority and you can set windows as your primary OS.
      My ComputerSystem Spec

  5. Posts : 394
    Windows 10 Pro

    If for some reason the command provided by MikeMecanic fails to resolve the issue then please post the output from within Debian of this command:

    sudo fdisk -l
    Lowercase L not 1.

    If needs be, you may have to reinstall GRUB but let's hope all works before then.
      My ComputerSystem Spec


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