/usr/ is in cl-closer-mop 2:0.6-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/common-lisp/systems/closer-mop.asd
/usr/share/
/usr/share/common-lisp/
/usr/share/common-lisp/systems/
/usr/share/common-lisp/source/
/usr/share/common-lisp/source/closer-mop/
/usr/share/common-lisp/source/closer-mop/closer-allegro.lisp
/usr/share/common-lisp/source/closer-mop/closer-clisp.lisp
/usr/share/common-lisp/source/closer-mop/closer-clozure.lisp
/usr/share/common-lisp/source/closer-mop/closer-cmu.lisp
/usr/share/common-lisp/source/closer-mop/closer-ecl.lisp
/usr/share/common-lisp/source/closer-mop/closer-lispworks.lisp
/usr/share/common-lisp/source/closer-mop/closer-mcl.lisp
/usr/share/common-lisp/source/closer-mop/closer-mop-packages.lisp
/usr/share/common-lisp/source/closer-mop/closer-mop-shared.lisp
/usr/share/common-lisp/source/closer-mop/closer-sbcl.lisp
/usr/share/common-lisp/source/closer-mop/closer-scl.lisp
/usr/share/common-lisp/source/closer-mop/features.lisp
/usr/share/common-lisp/source/closer-mop/closer-mop-system.cl
/usr/share/common-lisp/source/closer-mop/closer-mop.asd
/usr/share/doc/
/usr/share/doc/cl-closer-mop/
/usr/share/doc/cl-closer-mop/changelog.Debian.gz
/usr/share/doc/cl-closer-mop/supported-cls.txt
/usr/share/doc/cl-closer-mop/README.Debian
/usr/share/doc/cl-closer-mop/copyright
/usr/share/doc/cl-closer-mop/features.txt.gz
/usr/share/doc/cl-closer-mop/release-notes.txt.gz