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keijiro/recover_windows_boot_manager.md

Last active January 25, 2020 09:42
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How I recovered Windows Boot Manager removed by the Ubuntu installer.
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recover_windows_boot_manager.md

What happened

I upgraded Ubuntu 18.04 to 19.10 on my main PC. After installation, Windows Boot Manager disappeared from the GRUB boot menu. I found the EFI partition was missing the /EFI/Microsoft directory. It seemed that the Ubuntu installer mistakenly removed the boot manager from EFI.

How I recovered it

  • Create a Windows installation media (USB stick) using Windows Media Creation Tool.
  • Boot the Windows installer and choose "Repair your computer".
  • Launch the command prompt from the repair tool menu.
  • bcdboot [Windows drive]:\Windows /s [EFI drive]: /f UEFI
  • Reset and boot Windows Boot Manager via motherboard setup menu (BIOS).

I also had to use the boot-repair tool on Ubuntu to recover the Windows Boot Manager entry in the GRUB menu using.

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