Should be an easy fix how can I fix some curled up edges the paper is still good.can I put some white glue under it and tape it down till it dries?Thanks you guys in this forum are great!

We successfully removed the wallpaper with DIF and scraping, but now the hard part begins!!! Thankfully, there seems to be at least one coat of paint on top of the drywall, but... One wall is perfectly clean (well, close), but the others still seem to have adhesive on them. We've tried DIF, vinegar & water, hot water, sanding and TSP - none of which helped. We won't put up more paper, we plan on painting. Do we just prime over it and get on with our lives? ALSO, the previous owners used something to fix the seams that were coming up. None of the above had the least effect on those. When we try sanding, we hit wall board. Yikes, that can't be good. I actually uttered the word contractor tonight. HELP! I don't want to give up so easy.