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I have Windows 10 and Kubuntu 14.04 in Dual Boot.

While on Windows, I choose "Update and Restart". I left and when I came back, the computer was on Kubuntu Login Screen (Probably GRUB automatic launch). I didn't log, but choose restart in order to check the Windows update.

Now instead of GRUB, I have a HP screen saying "Boot Device not Found".

With LiveCD, I can access my files.


My boot-info

What should I do in order to retrieve the GRUB without reinstalling any OS ?

  • With Recommended Repair, I have this message : "GPT detected. Please create a BIOS-Boot partition (>1MB, unformatted filesystem, bios_grub flag). This can be performed via tools such as Gparted. Then try again." I'm not sure if I really should create one because there is already a EFI partition. – Astrid T900 Dec 7 '17 at 19:09
  • You might find the rEFInd tool very interesting. rodsbooks.com/refind/index.html – E.F. Nijboer Dec 7 '17 at 23:10
  • With rEFInd, I only have access to "Microsoft Recovery on RECOVERY". The messages includes "A required device isn't connected or can't be accessed. You need to use repair tools. error 0xc00000f" – Astrid T900 Dec 8 '17 at 5:04
  • Sorry for a somewhat late reaction. But you could also check the bios and check the boot options. Also, try to remove any usb (or any other ) devices connected. It might just be that some external storage device is used as boot device. Hope that might help. Otherwise it sounds like there is a very serious problem that might be very hard to solve. Conclusion might then be to backup important files (which is always a good thing to do) and accept the loss and reinstall. Good luck! – E.F. Nijboer Dec 10 '17 at 23:30
  • I am able to launch my Kubuntu session with rEFInd, but it's really slow to boot. In GParted, the EFI Partition and Microsoft Reserved Partition have "Unknown" as file system. My Media partition is still labelled and recognised as NTFS but file system can't be read. The SMART short self-test paste.ubuntu.com/26167107 find 8 pending sectors but I never managed to fix them. I'll probably clone Kubuntu and start over. (New question : is this HDD still safe ?). Thanks for rEFInd, it's a relief to see that my Kubuntu is intact. – Astrid T900 Dec 12 '17 at 1:57
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From experience it seems windows updates are becoming more destructive nowadays. This is something that happens to many people and you can easily find information to resolve it. Try the following link:

https://help.ubuntu.com/community/RecoveringUbuntuAfterInstallingWindows

Good luck!

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