I am pretty sure it's "plugged and turned on" - I am using it now on ...
Update: Solution found
"I dual booted Ubuntu 17.10 in my windows 10. While working in windows wifi works fine! But in Ubuntu it is always showing "No wifi adapter found, Make sure you have a wifi adapter plugged and turned on" Not getting any solutions online! Tried some of them but not working! Help please"
Solution from it:
"I had the same problem. I resolved it by unchecking the Allow the computer to turn off this device to save power option.
The option can be found under Device Manager → Network Adapters → your network adapter → Properties → Power Management. I guess it's more of a Windows problem than Ubuntu."
At least now I know who was switching off my wifi :)