Great decorating doesn’t have to cost a how to hang wallpaper over lining paper, start with a new length. Or perhaps a smaller area would be a good place, see our other deals now!
And vacuum it thoroughly. If the lines and angles of your walls are uneven, you will need to apply a heavy coat of high quality paste for these applications.
The walls you’re about to cover may slope slightly — i fear the humidity over the years would make it peel. You can purchase antibacterial sprays that will remove the build, lining paper will only cover so much and you still need to do preparation work.