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How to Fix Grub Bootloader with Windows 10 Linux Dual Boot

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In this video, I go over how to fix grub bootloader with Windows 10 and a Linux partition with dual boot. Sometimes Windows 10 will wipe out grub and you will need to repair it. This shows how to use www.supergrubdisk.org for the repair.

Related Videos for Help
How to use Grub Rescue: https://www.youtube.com/watch?v=r7meKJsjqfY
Custom Grub Menu: https://www.youtube.com/watch?v=3s7qBJ-H7vw
Repair Linux Boot: https://www.youtube.com/watch?v=9D3hvnnby9A
Fix Windows Startup: https://www.youtube.com/watch?v=sOihh4ZNOf4

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22 thoughts on “How to Fix Grub Bootloader with Windows 10 Linux Dual Boot

  1. 1) At 06:01 the Arch partition is detected but it only shows its EFI files.
    And it makes sense because it's coded like that: https://github.com/supergrub/supergrub/blob/41ed97fd1742b9435626a8bec4e60c9dda609d1e/menus/sgd/osdetect.cfg#L444-L456 .

    However that main logic was designed for the scenario when Windows was detected in a partition then it made no sense to search for Linux kernel in it. If you find efi files in a partition then it makes sense to search for kernel+initrd files too.

    Whenever this is fixed you should get a kernel+initrd boot entries next to the EFI files boot entries.
    These kernel+initrd boot entries are very useful because they would work even if you had deleted both the EFI and grub.cfg files (assuming you have not deleted the kernel and initrd images themselves).

    Well, I guess I shoud file an issue on the github repo and fix it later.

    2) If you revisit Super Grub2 Disk in the future make sure to take a look at the second partition on the disk. Some supported isos appear on the Boot Manually. Bootable ISOs submenu if you save them there.

    3) 02:11 : In order to have a second partition which it's FAT32 you need it to be 256 MB in size minimum so that many partition tools do not have problems with it. But I actually want that second partition to be empty. So it's all zeroes and, yeah, a lot of zeroes in a row compress too well.

    4) 08:41 : If I'm not mistaken grub-customizer remakes grub menues but it does not install grub. What I mean is that grub-install is not called under the hood. So you would need to issue grub-install command as explained here: https://www.supergrubdisk.org/wizard-restore-grub-with-super-grub2-disk/ (I must admit the howto is a bit outdated).

    5) I'm working on getting an stable Rescatux out there. If you find any issue or have any suggestions now it's the time to say something at: https://github.com/rescatux/rescapp/issues 😉 .

  2. Does this detect NVME drives by default? I have windows installed on my NVME drive and I've had issues with it being recognized by GRUB before. I actually somehow borked my Windows boot manager as well and had to install that on a separate drive than my OS to boot

  3. When you dual boot Windows and Linux install Linux in a separate partition. I stall the grub in the linux partition, don't install grub in windows. Then install Easy BCD in windows, this way you will have two separate OS and one will not harm the other.

  4. After installing Nvidia proprietary drivers my boot screen goes black after grub menu and they are no texts on the screen until i have successfully entered the correct password on my debian account lol …

    is this an accidental security layer coded in by Nvidia? Furthermore my computer doesn't detect Windows 10 installation after installing Debian 10.2 so with the black screen of death after grub menu selection, it makes perfect security for my computer when someone tries to use my computer not knowing what's going on lol.

  5. I wish you had posted this a day earlier. I had to reinstall grub yesterday when Windows nuked out my boot loader altogether. In BIOS, there was no Ubuntu or Windows Boot Manager option. Ended up fixing it with boot-repair but glad you made this video anyways

  6. I have Debian(installed first) then I shrunk partion and stuck on Kde Neon(both boot), now when I boot I have to pick the OS to boot, default is KDE Neon(if left alone). All I try and do to change the default back to Debian fail. Can you help me fix it? can you do a video on how to do it?

  7. My config:
    windows is on a separate SATA SSD drive, nothing else touches it … ever. Linux is on another drive, which can see windows via grub, but windows can't ever see Linux, so I am save 😀

    I run Fedora (primary) on a super fast nvme, Manjaro on another old spinning drive which can see Fedora and windows in turn, so I can boot windows from Linux grub either way from both Fedora and Manjaro.  

    IMO, bottom line is to never mix windows linux bootloaders on the main windows drive, that means never let windows be in charge of booting another OS, then you'll live a happy trouble free life.

  8. Is it possible to install Windows on another partition of the running hard disk from Linux? I tried for months to get Photoshop running on Linux. It just won't work. Now I noticed that every Windows iso is too big for my usb so I can't install it from a live boot without buying a new one.

  9. @Chris
    Coming back to the video of yesterday and earlier videos, you don't need to enter "sudo su", just "su" will do. You like to type as little as possible, right? 😉 By the way, I recommend to add a few simple hotkey-commands for rebooting, shutting down and suspending, it is easier than using the mouse for it. A topic-suggestion: updating a kernel manually.

  10. Isn't it wonderful that Microsoft 'fixes' your bootloader when Windows detects that the Windows-bootloader is missing? :p

    That is the recurring theme with MS, be it Windows or MS Office or any other MS-software. Microsoft does not play nice with others. Even their Azure-cloud, it runs a lot worse on Firefox than on Chromium, to the point that one website which uses it which I have to use doesn't even load regularly on Firefox.

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