/usr/lib/libreoffice/program/pythonloader.unorc is in python3-uno 1:5.1.2-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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PYUNO_LOADER_PYTHONPATH=$ORIGIN
PYTHONHOME=file:///usr/lib/python3.5
PYTHONPATH=$PYTHONHOME $PYTHONHOME/site-packages $PYTHONHOME/lib-dynload $PYTHONHOME/lib-tk $ORIGIN
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