/diy/ - Do It Yourself

I have a wall that I have removed wallpaper from. It was painted previously, and the top most layer of paint peeled right off with wallpaper in some spots, while still strongly adhering in others - see picture(despite the raised edges you can't just peel off the pain flakes easily).

What would be my best option to quickly and easily refinish the wall to be presentable? It doesn't have to be perfectly smooth or even, it just has to look acceptable if you don't look at it closely, it will be a temporary solution.
>how do I remove remaining paint
>what kind of paint can I use to paint it over

The wall is already rough as it is - it's either brick or cinder block, covered with plaster(but not the smooth kind, more like mortar in texture), painted with a thin layer of white primer that is not peeling off, and then the blue paint that is peeling off.

Is paint even an option or would just wallpapering it over after removing the peeling pain be easier and faster?