Updated windows 10, was a feature update or something

Reboot and can't boot into Debian, grub error

oopsies

The Windows PCs in our university are showing this popup for a while... "We have some new features for you"

Really have to concentrate on clicking the "ask me later" button instead of "reboot now". I am actually evolving and learning from my mistakes =D

That happened to me a while back. Windows decided to screw around with the drive partitions so GRUB was trying to load from the wrong parition. If your having the same issue I think the commands I used to get it to boot were

set prefix=<Correct Drive Partition>
insmod normal
normal

Use boot repair.

I had something similar happen on my dual boot winblows machine, dumped the OS and installed Ubuntu and life's great again