We are installing about 100 ft.² of interlocking hardwood on the floor where the linoleum peeled off but the glue adhesive is still stuck on the floor. The floor is very level, and we tried scraping off some of the adhesive but it was taking forever. Can I simply lay the new hardwood on top of the old dried-up adhesive?
As long as it is flat this should be a non-issue. Floating or nailing down a little left-over adhesive is "normal" and not a big deal.
If you really want to remove the adhesive, lightly mist with water, let it sit for a few minutes, then scrape it up.