Binary package “acl2-books-certs” in ubuntu bionic

Computational Logic for Applicative Common Lisp: library certificates

 ACL2 is both a programming language in which you can model computer
 systems and a tool to help you prove properties of those models.
 .
 This file contains certification records for the various precompiled
 libraries supplied in the ACL2-books package. ACL2 essentially
 requires that all included books be certified before use.