If you are using gutemine feed, he/she/it purposely deletes files from other peoples plugins. Mine included.
So if you have that on your box, then its a simple choice use his feed, or reflash and use all the other available plugins.
Thank you for the explanation!
Yes, that is the problem!
This guy ("gutemine") may be a megalomaniac!..
It turns out that with any luck I won't need any of it. So I tried uninstalling everything and now I have the green screen and boot loop :-( but that's my problem.
Anyway, thanks! At the latest now I decide against "gutemine" (translated ~ "good face") and for the really good ones.