Another option: remove drywall. Re-sheetrock the room.
The stuff is dirt cheap (5-10 bucks a sheet, depending on the price of tea in China or whatever it is that causes the prices to fluctuate wildly)
We have to remove wallpaper from an unprimed wall and realized that it's far more difficult and time consuming to do that than it would be to just gut and redo the sheetrock. For speed, I have a friend who does it for a living. He's going to do all the finishing work for a couple hundred (2 large rooms)