/usr/share/pyshared/gamera/plugins/ is in python-gamera 3.3.3-2ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/pyshared/gamera/plugins/arithmetic.py
/usr/share/pyshared/gamera/plugins/binarization.py
/usr/share/pyshared/gamera/plugins/color.py
/usr/share/pyshared/gamera/plugins/contour.py
/usr/share/pyshared/gamera/plugins/convolution.py
/usr/share/pyshared/gamera/plugins/corelation.py
/usr/share/pyshared/gamera/plugins/deformation.py
/usr/share/pyshared/gamera/plugins/draw.py
/usr/share/pyshared/gamera/plugins/edgedetect.py
/usr/share/pyshared/gamera/plugins/features.py
/usr/share/pyshared/gamera/plugins/geometry.py
/usr/share/pyshared/gamera/plugins/gui_support.py
/usr/share/pyshared/gamera/plugins/id_name_matching.py
/usr/share/pyshared/gamera/plugins/image_conversion.py
/usr/share/pyshared/gamera/plugins/image_utilities.py
/usr/share/pyshared/gamera/plugins/listutilities.py
/usr/share/pyshared/gamera/plugins/logical.py
/usr/share/pyshared/gamera/plugins/misc_filters.py
/usr/share/pyshared/gamera/plugins/misc_free_functions.py
/usr/share/pyshared/gamera/plugins/morphology.py
/usr/share/pyshared/gamera/plugins/numarray_io.py
/usr/share/pyshared/gamera/plugins/numeric_io.py
/usr/share/pyshared/gamera/plugins/numpy_io.py
/usr/share/pyshared/gamera/plugins/pagesegmentation.py
/usr/share/pyshared/gamera/plugins/pil_io.py
/usr/share/pyshared/gamera/plugins/png_support.py
/usr/share/pyshared/gamera/plugins/projections.py
/usr/share/pyshared/gamera/plugins/runlength.py
/usr/share/pyshared/gamera/plugins/segmentation.py
/usr/share/pyshared/gamera/plugins/string_io.py
/usr/share/pyshared/gamera/plugins/structural.py
/usr/share/pyshared/gamera/plugins/thinning.py
/usr/share/pyshared/gamera/plugins/threshold.py
/usr/share/pyshared/gamera/plugins/tiff_support.py
/usr/share/pyshared/gamera/plugins/transformation.py