/usr/share/gimp/2.0/gimpressionist/Presets/ is in gimp-data 2.6.12-1ubuntu1.4.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gimp/2.0/gimpressionist/Presets/ApplyCanvas
/usr/share/gimp/2.0/gimpressionist/Presets/Ballpark
/usr/share/gimp/2.0/gimpressionist/Presets/Canvas
/usr/share/gimp/2.0/gimpressionist/Presets/Crosshatch
/usr/share/gimp/2.0/gimpressionist/Presets/Cubism
/usr/share/gimp/2.0/gimpressionist/Presets/Dotify
/usr/share/gimp/2.0/gimpressionist/Presets/Embroidery
/usr/share/gimp/2.0/gimpressionist/Presets/Feathers
/usr/share/gimp/2.0/gimpressionist/Presets/Felt-marker
/usr/share/gimp/2.0/gimpressionist/Presets/Flowerbed
/usr/share/gimp/2.0/gimpressionist/Presets/Furry
/usr/share/gimp/2.0/gimpressionist/Presets/Line-art
/usr/share/gimp/2.0/gimpressionist/Presets/Line-art-2
/usr/share/gimp/2.0/gimpressionist/Presets/Maggot-invasion
/usr/share/gimp/2.0/gimpressionist/Presets/MarbleMadness
/usr/share/gimp/2.0/gimpressionist/Presets/Mossy
/usr/share/gimp/2.0/gimpressionist/Presets/Painted_Rock
/usr/share/gimp/2.0/gimpressionist/Presets/Parquette
/usr/share/gimp/2.0/gimpressionist/Presets/Patchwork
/usr/share/gimp/2.0/gimpressionist/Presets/Ringworks
/usr/share/gimp/2.0/gimpressionist/Presets/Sample
/usr/share/gimp/2.0/gimpressionist/Presets/Smash
/usr/share/gimp/2.0/gimpressionist/Presets/Straws
/usr/share/gimp/2.0/gimpressionist/Presets/Weave
/usr/share/gimp/2.0/gimpressionist/Presets/Wormcan