Sorry to hear of your troubles. The forced upgrade “feature” in Win10 is pathetic and despicable. It’s happened on a few occasions that I needed to use my PC, turned it on, but only to find it could not be used for an hour while Win10 installs its privacy-violating bloatware and reboots several times.
I also have Ubuntu 16.04 on this machine, which is what I usually use. That required a few tweaks to make touchscreen work well but the windows partition is accessible. I’d say now Ubuntu and the Unity windows manager are 90% good, not ideal - but at least there is something I can do about it.
Thank you for the warning, I will make sure my backups are up to date before I boot into win10.
The forced upgrade stuff can be turned off thru admin service and switched to manual..