When I bought my laptop I got Windows 8.1 with it. I didn't want to delete it immediately so I dual boot Ubuntu and used Windows only occasionally. Then one day

When I bought my laptop I got Windows 8.1 with it. I didn't want to delete it immediately so I dual boot Ubuntu and used Windows only occasionally. Then one day I couldn't start Windows because it was stuck in infinite update loop, even though I turned off updates because of those annoying "please update to win 10" messages. Now I run only Ubuntu.