/usr/share/gedit/plugins/latex/ui/ is in gedit-latex-plugin 3.20.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gedit/plugins/latex/ui/build_image_dialog.ui
/usr/share/gedit/plugins/latex/ui/choose_master_dialog.ui
/usr/share/gedit/plugins/latex/ui/configure.ui
/usr/share/gedit/plugins/latex/ui/configure_tool.ui
/usr/share/gedit/plugins/latex/ui/insert_bibtex_entry.ui
/usr/share/gedit/plugins/latex/ui/insert_graphics_dialog.ui
/usr/share/gedit/plugins/latex/ui/insert_listing_dialog.ui
/usr/share/gedit/plugins/latex/ui/insert_table_dialog.ui
/usr/share/gedit/plugins/latex/ui/new_document_template_dialog.ui
/usr/share/gedit/plugins/latex/ui/ui-toolbar-combined.builder
/usr/share/gedit/plugins/latex/ui/ui-toolbar-disabled.builder
/usr/share/gedit/plugins/latex/ui/ui-toolbar-normal.builder
/usr/share/gedit/plugins/latex/ui/use_bibliography_dialog.ui