/usr/share/pyshared/PyMca/PyMcaPlugins/ is in pymca 4.5.0-4.
This file is owned by root:root, with mode 0o755.
..
/usr/share/pyshared/PyMca/PyMcaPlugins/BM05TwoThetaPlugin.py
/usr/share/pyshared/PyMca/PyMcaPlugins/BackgroundScanPlugin.py
/usr/share/pyshared/PyMca/PyMcaPlugins/BackgroundStackPlugin.py
/usr/share/pyshared/PyMca/PyMcaPlugins/CalculationThread.py
/usr/share/pyshared/PyMca/PyMcaPlugins/ExternalImagesStackPlugin.py
/usr/share/pyshared/PyMca/PyMcaPlugins/FitStackPlugin.py
/usr/share/pyshared/PyMca/PyMcaPlugins/MathPlugins.py
/usr/share/pyshared/PyMca/PyMcaPlugins/MedianFilterStackPlugin.py
/usr/share/pyshared/PyMca/PyMcaPlugins/NNMAStackPlugin.py
/usr/share/pyshared/PyMca/PyMcaPlugins/NormalizationPlugins.py
/usr/share/pyshared/PyMca/PyMcaPlugins/PCAStackPlugin.py
/usr/share/pyshared/PyMca/PyMcaPlugins/Plugin1DBase.py
/usr/share/pyshared/PyMca/PyMcaPlugins/ROIStackPlugin.py
/usr/share/pyshared/PyMca/PyMcaPlugins/RegularMeshPlugin.py
/usr/share/pyshared/PyMca/PyMcaPlugins/ReverseStackPlugin.py
/usr/share/pyshared/PyMca/PyMcaPlugins/SG1DPlugins.py
/usr/share/pyshared/PyMca/PyMcaPlugins/SplinePlugins.py
/usr/share/pyshared/PyMca/PyMcaPlugins/StackBrowserPlugin.py
/usr/share/pyshared/PyMca/PyMcaPlugins/StackNormalizationPlugin.py
/usr/share/pyshared/PyMca/PyMcaPlugins/StackPluginBase.py
/usr/share/pyshared/PyMca/PyMcaPlugins/__init__.py