/usr/share/ubiquity-slideshow/slides/l10n/ar/ is in ubiquity-slideshow-edubuntu 83.
This file is owned by root:root, with mode 0o755.
..
/usr/share/ubiquity-slideshow/slides/l10n/ar/accessibility.html
/usr/share/ubiquity-slideshow/slides/l10n/ar/calc.html
/usr/share/ubiquity-slideshow/slides/l10n/ar/calibre.html
/usr/share/ubiquity-slideshow/slides/l10n/ar/desktop-software.html
/usr/share/ubiquity-slideshow/slides/l10n/ar/documentation.html
/usr/share/ubiquity-slideshow/slides/l10n/ar/edubuntu-menu-editor.html
/usr/share/ubiquity-slideshow/slides/l10n/ar/empathy.html
/usr/share/ubiquity-slideshow/slides/l10n/ar/freemind.html
/usr/share/ubiquity-slideshow/slides/l10n/ar/installing-software.html
/usr/share/ubiquity-slideshow/slides/l10n/ar/kdeedu.html
/usr/share/ubiquity-slideshow/slides/l10n/ar/librecad.html