/usr/share/man/man3/semanage_user_exists.3.gz is in libsemanage1-dev 2.3-1build3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man3/semanage_exists.3.gz
/usr/share/man/man3/semanage_exists.3.gz