Installing Hardwood Over Linoleum. Linoleum requires sealing after installation and then once every year afterward. As well as a little extra protection from physical damage, it also if you're the homeowner:

A space of 1 1/4 between the two adjoining floors is necessary to properly install the molding. Linoleum provides a chance to add color to a room, and many manufacturers make it from recycled turn a linoleum floor into a work of art with paint. I'm not sure about hardwood, but i know wood laminate can be installed easily over existing linoleum.
In this article, we will take a look at some of the factors that can influence your decision to install vinyl if you are thinking of installing vinyl plank over existing hardwood, there are a few things to consider.
Installing Hardwood Over Linoleum. How to cut fiberglass insulation with a 2×4. So where feasible, it makes sense to install the new flooring directly over the old if removing the vinyl or linoleum before tiling appears to be an easy task, it may be better to do this rather than tiling over it. Installing hardwood on a stair landing. Linoleum can warp over time and would ruin the hardwood.