Primer over joint compound and painted wallpaper
I just moved into a house built in 1930, whose previous owners from long ago painted over the wallpaper. To eliminate some of the bubbles in the wall, we had to take off a corner of the wallpaper (which wasn't easy), and a bunch of the plaster wall behind it came with it. The wall underneath was full of cracks. So, we won't be taking down any more of this wallpaper. The exposed area has been coated with joint compound. My question is, what do I use for primer over these walls? I've got joint compound and painted wallpaper. Is there one primer that would work for both?
Thank you, anyone, for your help!