Papering over fresh plaster.

rainbow12

I have recently plastered the walls in a room (not a brilliant job but good enough to be lined and then painted). I waited a couple of weeks then sized the walls and allowed to dry. Whilst I was hanging lining paper it didnt seem to be adhering well so I pasted wallpaper adhsive onto the walls and the paper.
However, the paper is all peeling off (the paper where I pasted the walls as well as the paper isnt peeling but I dont think it has dried out fully yet - it was done yesterday).

I have put lining paper over fresh plaster in the past without problems in another room and the paper is still stuck fast (even though it was also painted afterwards).
I dont remember sizing the previous room, I have a feeling I might have used a pva solution - does this sound right?
I wonder whether I should use watered down paint to seal the plaster before then wallpapering?
If I go down the sealing route (whether PVA or paint) have I creasted a nightmare with the wallpaper paste or can I just go straight over it?
I would appreciate any help - this is turning into a nightmare - I used to enjoy and be relatively good at DIY but thesedays everything seems to be a disaster!

BTW I cant wait several months to re-paper, as I am hoping to sell my house asap.