/usr/share/man/man3/read_premib_configs.3snmp.gz is in libsnmp-dev 5.4.3~dfsg-2.4ubuntu1.3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man3/read_config.3snmp.gz
/usr/share/man/man3/read_config.3snmp.gz