/usr/share/man/man3/brlapi_libcerrno.3.gz is in libbrlapi-dev 5.0-2ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man3/brlapi_error.3.gz
/usr/share/man/man3/brlapi_error.3.gz