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I use a lot of different VMs for testing software and running one-off programs. My setup is a 16GB Dell Precision Laptop with an i7 quad core running Ubuntu (really "Elementary OS" which is based on Ubuntu, but eOS has a super-slick desktop that I really like) and a 1TB SSD. I use kvm to host my various VMs which include versions of Ubuntu, Windows 7, etc. When I get around to it, I'll switch to Docker or Rocket and use the container model, but for now it was just easier to build (or clone) a tiny VM when I need it.
I've been using this VM setup for a while and it worked fine with WinXP, Win7, Ubuntu, etc, but when I wanted to copy my Win7 image and upgrade to Win10, I faced a LOT of frustration. All the combinations of configuration on the KVM panel failed to get past the 0xc1900101-0x30018 error and the "The installation failed in the SAFE_OS phase with an error during BOOT operation. 0xC1900101 – 0x20017" error I would get. The Win10 upgrade would fail and I'd be back to starting over.
I tried a bunch of suggestions (mostly change my video card, change my disk interface from IDE to SATA or SATA to SCSI or... etc.), but none of those things helped.
I finally figured it out after reading about similar problems with KVM and Windows 8.1 upgrades to Win 10...
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