/usr/share/man/man1/acl_grant.1.gz is in rsbac-admin 1.4.0-repack-0ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man1/rsbac-admin.1.gz
/usr/share/man/man1/rsbac-admin.1.gz