/usr/share/ubiquity-slideshow/slides/l10n/nl/ is in ubiquity-slideshow-edubuntu 113.
This file is owned by root:root, with mode 0o755.
..
/usr/share/ubiquity-slideshow/slides/l10n/nl/accessibility.html
/usr/share/ubiquity-slideshow/slides/l10n/nl/arkose.html
/usr/share/ubiquity-slideshow/slides/l10n/nl/calc.html
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/usr/share/ubiquity-slideshow/slides/l10n/nl/welcome.html