/usr/share/common-lisp/source/ is in cl-utilities 1.2.4-3.1.
This file is owned by root:root, with mode 0o755.
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/usr/share/common-lisp/source/cl-utilities/
/usr/share/common-lisp/source/cl-utilities/cl-utilities.asd
/usr/share/common-lisp/source/cl-utilities/collecting.lisp
/usr/share/common-lisp/source/cl-utilities/compose.lisp
/usr/share/common-lisp/source/cl-utilities/copy-array.lisp
/usr/share/common-lisp/source/cl-utilities/expt-mod.lisp
/usr/share/common-lisp/source/cl-utilities/extremum.lisp
/usr/share/common-lisp/source/cl-utilities/once-only.lisp
/usr/share/common-lisp/source/cl-utilities/package.lisp
/usr/share/common-lisp/source/cl-utilities/read-delimited.lisp
/usr/share/common-lisp/source/cl-utilities/rotate-byte.lisp
/usr/share/common-lisp/source/cl-utilities/split-sequence.lisp
/usr/share/common-lisp/source/cl-utilities/test.lisp
/usr/share/common-lisp/source/cl-utilities/with-unique-names.lisp