I recently posted the following:-
Well I think I have found an easier answer to get rid of the most stubborn paint rather than using just a scraper or steam etc.
I wanted to see just how bad it would look at just putting the wallpaper on the wall without scraping all the old paint off. It looked awful, but as a bonus, something in the paste must have reacted with the emulsion paint that made it lift off the plaster because now, I can use the scraper with very little effort to remove it.
Hope this helps those of you who have similar problems in the future.
-- troubleinstore