First off, you need to know what embossed coverings and lincrusta are. Both of them fall under the category of textured or patterned wall-coverings. While both add oomph to your abode, the difference is lincrusta is known to survive for hundreds of years, and is paintable. Lincrusta is stuck using a mixture of linseed oil and wood flour which hardens over time, making the wallpaper tougher as the years pass.
To remove embossed paper, you need to first abrade the covering using a coarse material. Once the surface has been roughened enough, just soak it (or steam it) as mentioned earlier and scrap away the covering. Just make sure you allow plenty of soaking time before you start scraping away the paper. As for lincrusta, the strong adhesive will demand a lot of patience from your side. Instead of warm water or steam, use hot water and scraper to peel away the paper. There will still be a lot of adhesive residue left on the walls after the paper has been peeled off. Just soak that in water till it becomes soft and then you can scrap/scrub it away.
These too are the toughest among the lot to remove. But with a little persistence you can make anything happen!