/usr/share/man/man8/unregister-common-lisp-source.8.gz is in common-lisp-controller 7.8.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man8/register-common-lisp-implementation.8.gz
/usr/share/man/man8/register-common-lisp-implementation.8.gz