/usr/lib/libreoffice/share/extensions/nlpsolver/description-en-US.txt is in libreoffice-nlpsolver 0.9+LibO6.0.3-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | This extension integrates into Calc and offers new Solver engines to use for optimizing nonlinear programming models.
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