Grub rescue (removing dual boot) Solved

Question

Hello,

I had a dual boot on my machine: Windows 10 Pro, Ubuntu. The dual boot was functioning via GNU/Grub.
Since I was using Ubuntu more, I wanted to remove the dual boot. I don't know what I did, but it's not working properly anymore, and it's outside my area of expertise. The tutorials I find are meant to "rebuild" the dual boot. However, what I'm interested in is getting my system to boot directly into Windows.

I have a command prompt that says: "grub rescue no such partition"
with a "grub rescue" command prompt, I did ls, I have several things, then when doing an ls of each element, I always get "filesystem is unknown"...

I have a bootable Windows 10 USB drive, where, when I launch the Windows command prompt and access Diskpart, and I run "list volume", the drive letters of my disks are wrong. I have a data hard drive (which normally gets the letter D:), now showing as drive C:, and my drive that normally has the letter C, is now F.

Could you help me fix my system? Reinstalling Windows 10 doesn't really appeal to me, as I have license keys with programs, and I'm not very motivated to pay for everything again...

Thank you in advance for your help =)

Configuration: Macintosh / Firefox 76.0

Malekal_morte- · Answer

Hello,

If you are in UEFI, you just need to boot from Windows Boot Manager.
You can set it as the first in the boot order.
This might allow you to access Windows 10.
From there, you can use a utility to remove the Linux entry.
See: Remove dual-boot and grub to restore Windows.

If nothing works:

From a working computer: Use Media Creation on a valid computer to create a USB installation drive: https://www.microsoft.com/fr-fr/software-download/windows10

Boot from it by changing the boot sequence and indicating the USB drive or DVD: How to boot the computer from USB drive
You will arrive at the Windows installer.
Go to Repair your computer (menu at the bottom left on the main page)
Advanced troubleshooting options
Command prompt
type diskpart and press enter

Give the results of the following commands:


list disk
sel disk 0
list partition
list volume
exit

Take a photo of the results and provide the results in a screenshot.

and provide the result of the command:

bcdedit /v

Take a photo of the results and give the results in a screenshot.

--
Please press a key to continue the disinfection...

us_marshal · Answer

Thank you for your reply!

I am not in UEFI, when I boot from my SSD (where Windows is installed) I end up in grub rescue.

Also, now that there is a photo, to clarify: normally the C: drive is volume 2, and D is volume 0 (list volume).

Thank you!

us_marshal · Answer

And here is the result =    Thank you :)

Malekal_morte- · Answer

In the advanced recovery options, you have system tools. Try to launch it.  Otherwise, try this in the command prompt: bootsect /nt60 c: /mbrbcdboot C:\Windows  and then restart.

us_marshal · Answer

Thank you, the first step worked, however, the second one ... did not  isn't it related to the letter assignment issue that I mentioned to you recently? Thank you

us_marshal · Answer

Thus :   ? Thank you

us_marshal · Answer

I took the liberty of going to your website, where you posted a video that explains the procedure very well. Thank you very much for your work! You really saved my neck!!!

us_marshal · Answer

Yes, I did as you showed in your video. I included the detail with /l fr-fr and then I adapted the drive letters. And now: "writing successful", rebooting and Windows is loading! Awesome, saved a few hundred euros on the license! A huge thank you...!
How can I thank you?

us_marshal · Answer

Thank you to you too!

Grub rescue (removing dual boot)

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