/usr/lib/goffice/0.8.17/plugins/ is in libgoffice-0.8-8-common 0.8.17-3.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/goffice/0.8.17/plugins/plot_barcol/
/usr/lib/goffice/0.8.17/plugins/plot_barcol/gog-area-prefs.ui
/usr/lib/goffice/0.8.17/plugins/plot_barcol/gog-barcol-prefs.ui
/usr/lib/goffice/0.8.17/plugins/plot_barcol/gog-minmax-prefs.ui
/usr/lib/goffice/0.8.17/plugins/plot_distrib/
/usr/lib/goffice/0.8.17/plugins/plot_distrib/gog-boxplot-prefs.ui
/usr/lib/goffice/0.8.17/plugins/plot_distrib/gog-double-histogram-prefs.ui
/usr/lib/goffice/0.8.17/plugins/plot_distrib/gog-histogram-prefs.ui
/usr/lib/goffice/0.8.17/plugins/plot_pie/
/usr/lib/goffice/0.8.17/plugins/plot_pie/gog-pie-prefs.ui
/usr/lib/goffice/0.8.17/plugins/plot_pie/gog-pie-series.ui
/usr/lib/goffice/0.8.17/plugins/plot_pie/gog-ring-prefs.ui
/usr/lib/goffice/0.8.17/plugins/plot_radar/
/usr/lib/goffice/0.8.17/plugins/plot_radar/gog-color-polar-prefs.ui
/usr/lib/goffice/0.8.17/plugins/plot_radar/gog-polar-prefs.ui
/usr/lib/goffice/0.8.17/plugins/plot_surface/
/usr/lib/goffice/0.8.17/plugins/plot_surface/gog-xyz-prefs.ui
/usr/lib/goffice/0.8.17/plugins/plot_surface/gog-xyz-surface-prefs.ui
/usr/lib/goffice/0.8.17/plugins/plot_xy/
/usr/lib/goffice/0.8.17/plugins/plot_xy/gog-bubble-prefs.ui
/usr/lib/goffice/0.8.17/plugins/plot_xy/gog-xy-color-prefs.ui
/usr/lib/goffice/0.8.17/plugins/plot_xy/gog-xy-dropbar-prefs.ui
/usr/lib/goffice/0.8.17/plugins/plot_xy/gog-xy-prefs.ui
/usr/lib/goffice/0.8.17/plugins/plot_xy/gog-xy-series-prefs.ui
/usr/lib/goffice/0.8.17/plugins/smoothing/
/usr/lib/goffice/0.8.17/plugins/smoothing/gog-exp-smooth.ui
/usr/lib/goffice/0.8.17/plugins/smoothing/gog-moving-avg.ui