I installed Ubuntu on my Lenovo y50-70.

I did the partitioning part OK I think, and the Ubuntu works OK, but when I try to choose Windows, I get this error: "The Boot Configuration Data for your PC is missing or contains errors."

Windows Boot Manager  

Windows failed to start. A recent hardware or software change might be the cause. To fix the problem:   1. Insert your Windows installation disc and restart your computer.   2. Choose your language settings, and then click "Next."   3. Click "repair your computer." If you don't have this disc, contact your system administrator or computer manufacturer for assistance.   File: \Boot\BCD   Status: 0xc000000c   Info: The Boot Configuration Data for your PC is missing or contains errors.

I've tried to reinstall Windows, and then I tried to format the whole computer and restore it to factory's settings, but whenever I get to GRUB Ubuntu keeps popping up and when I try to choose Windows I get the same error.

Apparently grub can't find Windows even though it is there. I can reach it manually when opening the boot menu as suggested here.

Here's the Boot Info Script output: http://paste.ubuntu.com/p/XXbJKmHQWR/

  • at present your system running on ubuntu or both? – PRATAP Jun 21 '18 at 14:33
  • Could you please run Boot-Info and edit your question to include a link to its resulting info log? Thanks. – David Foerster Jun 21 '18 at 15:42

The windows bootloader is very destructive and messes up all other bootloaders installed on the system. As a result, you should first install windows with the capacity you would like it to have, and then follow this guide: https://www.tecmint.com/install-ubuntu-16-04-alongside-with-windows-10-or-8-in-dual-boot/. Essentially, you should install ubuntu alongside windows 10, with Windows 10 installed first.

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In contrast to @DevSingh's answer, a possible (but cowardly) choice is to keep separate bootloaders for Windows and Ubuntu, and then to select which system to launch from the BIOS boot menu. Just adds a few seconds on each startup.

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  • this is what i did in the mean while... but when i have a bit of time i'm gonna try and fix it properly.. thanks – Noa W Jun 25 '18 at 9:40

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