/usr/lib/x86_64-linux-gnu/libuno_purpenvhelpergcc3.so.3 is in uno-libs3 6.0.3-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/../libreoffice/program/libuno_purpenvhelpergcc3.so.3