Do I need a floor board to install vinyl in kitchen?

Almost all vinyl can be installed direct on cement. The only problem may be the type of old adhesive. If the old glue was black, that is black not just dark brown, take a sample of the glue to the flooring store. Ask the store if its ok to go over. If you are having a pro installer do the work ask them to look at the concrete. If you are going to do yourself, Look at dura-step by Armstrong. You can lay it over concrete without glue.