painted viynal onto newly plasterd walls now bubbling cant get wallpaper on help

You really should completely strip this paint you’ve applied back to bare as if it was wallpaper. A Matt emulsion/ water mix (50/50 ratio is suggested) mist coat should be used as the Vinyl Matt you’ve applied will hold moisture behind it & the bubbling/blisters will continue & could even get worse. As you’ve paid out for new plastering, it’s worth going to the trouble of doing it correctly for long lasting paintwork.

It's such a shame that this pitfall is not more widely known about in DIY spheres. Any good painter should know how to mist-coat newly plastered walls and not to use vinyl paint to do so. Once the walls (and mist-coat) are completely bone dry, and I do mean BONE DRY, it's OK to use vinyl paints. I do this regularly and never had any issues. The problem arises when people rush jobs (or don't know) and the walls are not fully cured and dry. Even the slightest bit of moisture left in the plaster will eventually come to the surface and not be able to get through the skin of the vinyl paint. The same goes for if vinyl wallpaper is used over a mist-coat. In an ideal world you could mist-coat and top coat with non-vinyl paint and all will be fine as the wall will be able to 'breathe' still, I.E. moisture will be able to escape. OR you use vinyl paint but ONLY once walls are completely dry and it can be hard to know when this is the case if you're a DIY'er. In your situation the correct thing to do would be to strip back as said above and start over. However we all know this is not practical and the odds of somebody actually going to the effort are not good! However seen as you've already papered the chimney this will have to come off I'm afraid. Then just let everything dry for a few days, keep heating on / windows open etc and then paper it again.