/usr/ is in cl-interpol 0.2.6-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/
/usr/share/common-lisp/
/usr/share/common-lisp/source/
/usr/share/common-lisp/source/cl-interpol/
/usr/share/common-lisp/source/cl-interpol/alias.lisp
/usr/share/common-lisp/source/cl-interpol/cl-interpol.asd
/usr/share/common-lisp/source/cl-interpol/packages.lisp
/usr/share/common-lisp/source/cl-interpol/read.lisp
/usr/share/common-lisp/source/cl-interpol/specials.lisp
/usr/share/common-lisp/source/cl-interpol/util.lisp
/usr/share/common-lisp/systems/
/usr/share/doc/
/usr/share/doc/cl-interpol/
/usr/share/doc/cl-interpol/changelog.Debian.gz
/usr/share/doc/cl-interpol/copyright
/usr/share/doc/cl-interpol/index.html
/usr/share/common-lisp/systems/cl-interpol.asd