/usr/share/man/man5/localgroups.5.gz is in inn2 2.6.0-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man5/../man8/docheckgroups.8.gz
/usr/share/man/man5/../man8/docheckgroups.8.gz