/usr/share/guile/1.8/oop/ is in guile-1.8-libs 1.8.8+1-10ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/guile/1.8/oop/goops/
/usr/share/guile/1.8/oop/goops.scm
/usr/share/guile/1.8/oop/goops/accessors.scm
/usr/share/guile/1.8/oop/goops/active-slot.scm
/usr/share/guile/1.8/oop/goops/compile.scm
/usr/share/guile/1.8/oop/goops/composite-slot.scm
/usr/share/guile/1.8/oop/goops/describe.scm
/usr/share/guile/1.8/oop/goops/dispatch.scm
/usr/share/guile/1.8/oop/goops/internal.scm
/usr/share/guile/1.8/oop/goops/old-define-method.scm
/usr/share/guile/1.8/oop/goops/save.scm
/usr/share/guile/1.8/oop/goops/simple.scm
/usr/share/guile/1.8/oop/goops/stklos.scm
/usr/share/guile/1.8/oop/goops/util.scm