Painting over different colured plaster?

Hello. I have jusy recently bought a house which I am refurbing at the
moment. After stripping off the old wallpaper (with the intension of
painting them) the walls have a slight different colour on the top 3/4
of the room then the bottom. (Think the previous owner had some work
done to the house)

I was told them painting on them directly would give me an slight
uneven texture on the painted walls (even with 2 x undercoats) and
lining the walls first would be the way to go. Id this right? Is there
any other way? Would applying 2 undercoast not suffice? Seems lining
the walls with paper first seems a lot of hassle!

Cheers

.

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