This is how Windows 10 messed up GRUB

...or how to complete the upgrade to Windows 10 if you have dual-boot
Published on September 11, 2016 in How-tos
Read time: 1 min

A few weeks ago Windows 10 build 1609 was out. For me, it was nothing to be exited about but a new browser to test my websites on.

Upgrading to Windows 10 on a dual-boot machine

Unfortunately yesterday the Linux installation on my netbook, which I use for less important tasks, left me with a bunch of error screens. Then I’ve just booted to Windows 7 to finish my work when the idea of installing Windows 10 came to mind. So I’ve downloaded the ISO from my BizSpark account and put it on a USB drive.

It took a while on that little Atom N550-powered computer for the first restart to happen. But after that, GRUB (the Linux dual-boot menu) has KO. An error message told me it was missing.

Sorting out the issue

If you’re in the same situation, don’t worry, your Windows 10 installation process is still safe.

  1. Turn the computer off

  2. Get a Windows media installation (Windows 7 or above) and boot from it

  3. Choose your default Language, Time and Keyboard Input on the first window and click next

  4. You’re now presented with 3 choices. Click on Repair Your Computer

  5. Choose Windows 10 as installation

  6. Select Command Prompt

  7. Run bootsect /nt60 C: /force /mbr

  8. Reboot and remove the installation media

Your Windows 10 should continue the installation from where it was stopped.

Thanks for reading.


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