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The title is my theory of what happened, but I'm not certain: I installed Ubuntu alongside Windows 10, but while I am now able to boot Ubuntu without any issue, I am not longer able to boot Windows 10.

When selecting a boot in the BIOS settings, I do see the Windows 10 boot, in addition to the Ubuntu boot.

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But when I select Windows 10, the following screen displays "Preparing Automatic Repair".

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And from there it leads me to a blue screen with the main option being "Exit and go to Windows 10". But when I click that, the computer reboots and returns me to the boot selection screen.

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I am almost sure that the Windows 10 partition is still there and was not formatted, but it seems like the Windows 10 boot isn't able to find or access it.

Any idea how I can fix this and properly boot Windows 10?

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  • Was the Ubuntu install in UEFI mode_
    – David DE
    Commented Oct 17, 2021 at 8:29
  • I'm not sure to be honest :/
    – krimo33
    Commented Oct 17, 2021 at 8:45
  • There most likely lies the problem.
    – David DE
    Commented Oct 17, 2021 at 9:01
  • how could I fix it then?
    – krimo33
    Commented Oct 17, 2021 at 9:16
  • It's not that. If Ubuntu was installed in legacy mode it wouldn't have detected the other OSes EFI entries. Now, dear @krimo33, when installing OSes being "almost sure" is not good enough and not having backups is asking for trouble. OS and software can always be reinstalled but it only takes a small error to have those import personal files gone forever. Next, here's what you should try before anything else: Commented Oct 17, 2021 at 12:34

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