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In page Paleo-European languages:

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There is no direct evidence of the languages spoken in the Neolithic. Paleolinguistic attempts to extend the methods of historical linguistics to the Stone Age have little academic support. Donald Ringe, criticizing scenarios that envision only a small number of Neolithic language families spread over huge areas of Europe, has argued on general principles of language geography applying to "tribal" pre-state societies, and the scant remains of non-Indo-European languages attested in ancient inscriptions, that Neolithic Europe must have been a place of great linguistic diversity, with many language families having no recoverable linguistic links to one another, much like western North America before European colonisation.[1]