/usr/share/acl2-8.0dfsg/books/centaur/satlink/ is in acl2-books-source 8.0dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/acl2-8.0dfsg/books/centaur/satlink/benchmarks.lisp
/usr/share/acl2-8.0dfsg/books/centaur/satlink/cert.acl2
/usr/share/acl2-8.0dfsg/books/centaur/satlink/check-config.lisp
/usr/share/acl2-8.0dfsg/books/centaur/satlink/cnf-basics.lisp
/usr/share/acl2-8.0dfsg/books/centaur/satlink/cnf.lisp
/usr/share/acl2-8.0dfsg/books/centaur/satlink/config.lisp
/usr/share/acl2-8.0dfsg/books/centaur/satlink/dimacs-lits.lisp
/usr/share/acl2-8.0dfsg/books/centaur/satlink/dimacs.lisp
/usr/share/acl2-8.0dfsg/books/centaur/satlink/litp.lisp
/usr/share/acl2-8.0dfsg/books/centaur/satlink/lrat-interface.lisp
/usr/share/acl2-8.0dfsg/books/centaur/satlink/portcullis.acl2
/usr/share/acl2-8.0dfsg/books/centaur/satlink/portcullis.lisp
/usr/share/acl2-8.0dfsg/books/centaur/satlink/solvers/
/usr/share/acl2-8.0dfsg/books/centaur/satlink/solvers/cert.acl2
/usr/share/acl2-8.0dfsg/books/centaur/satlink/solvers/test-glucose-cert.lisp
/usr/share/acl2-8.0dfsg/books/centaur/satlink/solvers/test-glucose.lisp
/usr/share/acl2-8.0dfsg/books/centaur/satlink/solvers/test-lingeling.lisp
/usr/share/acl2-8.0dfsg/books/centaur/satlink/solvers/test-penelope.lisp
/usr/share/acl2-8.0dfsg/books/centaur/satlink/solvers/test-plingeling.lisp
/usr/share/acl2-8.0dfsg/books/centaur/satlink/solvers/test-riss3g-cert.lisp
/usr/share/acl2-8.0dfsg/books/centaur/satlink/solvers/test-riss3g.lisp
/usr/share/acl2-8.0dfsg/books/centaur/satlink/solvers/test-riss3gSimp.lisp
/usr/share/acl2-8.0dfsg/books/centaur/satlink/top.lisp
/usr/share/acl2-8.0dfsg/books/centaur/satlink/varp.lisp