/usr/share/common-lisp/source/ is in cl-asdf 2:3.1.6-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/common-lisp/source/cl-asdf/
/usr/share/common-lisp/source/cl-asdf/action.lisp
/usr/share/common-lisp/source/cl-asdf/asdf.asd
/usr/share/common-lisp/source/cl-asdf/asdf.lisp
/usr/share/common-lisp/source/cl-asdf/backward-interface.lisp
/usr/share/common-lisp/source/cl-asdf/backward-internals.lisp
/usr/share/common-lisp/source/cl-asdf/build/
/usr/share/common-lisp/source/cl-asdf/build.xcvb
/usr/share/common-lisp/source/cl-asdf/build/asdf.lisp
/usr/share/common-lisp/source/cl-asdf/bundle.lisp
/usr/share/common-lisp/source/cl-asdf/cache.lisp
/usr/share/common-lisp/source/cl-asdf/component.lisp
/usr/share/common-lisp/source/cl-asdf/concatenate-source.lisp
/usr/share/common-lisp/source/cl-asdf/contrib/
/usr/share/common-lisp/source/cl-asdf/contrib/debug.lisp
/usr/share/common-lisp/source/cl-asdf/contrib/detect-multiply-used-files.lisp
/usr/share/common-lisp/source/cl-asdf/contrib/fasl-op.lisp
/usr/share/common-lisp/source/cl-asdf/contrib/fast-compile-op.lisp
/usr/share/common-lisp/source/cl-asdf/contrib/wild-modules.lisp
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/usr/share/common-lisp/source/cl-asdf/operation.lisp
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/usr/share/common-lisp/source/cl-asdf/system.lisp
/usr/share/common-lisp/source/cl-asdf/tools/
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/usr/share/common-lisp/source/cl-asdf/tools/install-asdf.lisp
/usr/share/common-lisp/source/cl-asdf/tools/load-asdf.lisp
/usr/share/common-lisp/source/cl-asdf/uiop/
/usr/share/common-lisp/source/cl-asdf/uiop/README.md
/usr/share/common-lisp/source/cl-asdf/uiop/asdf-driver.asd
/usr/share/common-lisp/source/cl-asdf/uiop/backward-driver.lisp
/usr/share/common-lisp/source/cl-asdf/uiop/build.xcvb
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/usr/share/common-lisp/source/cl-asdf/uiop/contrib/
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/usr/share/common-lisp/source/cl-asdf/uiop/driver.lisp
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/usr/share/common-lisp/source/cl-asdf/uiop/run-program.lisp
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/usr/share/common-lisp/source/cl-asdf/uiop/uiop.asd
/usr/share/common-lisp/source/cl-asdf/uiop/utility.lisp
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/usr/share/common-lisp/source/cl-asdf/version.lisp-expr