Windows 10: Windows 10 won't boot after installing Linux on the same disk

I wanted to set up my PC to dual-boot Windows 10 or KDE Neon (a Linux distribution based on Ubuntu). I already had Win10 and I wanted to put Ubuntu on the same SSD. Apparently I messed something up because now when I boot Windows 10, the following happens:

• I get a screen with the Windows logo and a spinning "loading" thing, with a caption reading "Preparing Automatic Repairs"
• Then the caption becomes "Diagnosing your PC"
• Then the caption becomes "Attempting repairs"
• The first time I did this, it spent a good while "attempting repairs" and then restarted.
• Since then, every attempt to boot has stopped after a few seconds of "attempting repairs" with the message that Windows couldn't repair itself, and an "advanced options" button which gives me all the troubleshooting utilities (reset, restore from ISO, cmd, etc.)

There is nothing I need to recover, so I have no problem with just reinstalling Windows, except that I don't have any installation media, and the options to reset/reinstall Windows just fail with a message saying that, uh, they failed. I don't have a system restore point (although I do remember making one) and I don't have a disk image to restore from. I could use the command line for troubleshooting, but I don't know where to start (that's why I'm here!).
When I installed Linux, I chose to place the bootloader on the disk, not on the partition with Linux.
Based on some quick Web research, I thought I might have overwritten essential Windows boot code, so I tried using a couple of software tools (Testdisk and Boot Repair) but to no avail.

:)

 

Disk boot failure!!!

You can format the disk with like fdisk or something. A linux disk would make more sense but you say it won`t boot....

 

How to go about building a tri-boot system?

i dual boot all the time, and going in to tri boot is easy.

step 1) partition the drive in to 3 partitions ( leaving 1 empty for the linux installer. )
step 2) install windows on the first 2 partitions.
step 3) install linux, and let it auto partition the remaining space. ( i recommend at least 30gb of space for linux, because it will make things a lot easier. )

step 4) enjoy.

 

Windows 10: cannot complete upgrade with Linux installed

Hi Techiah,

If you’re having problems updating Windows 10 with Linux installed, we suggest to follow the steps on the article:
How to: Upgrade a dual boot installation of Windows and
Linux to Windows 10 - Part 1. It contains troubleshooting steps that you can perform to help you resolve the issue.

Don’t hesitate to reach out if you have other questions.