/usr/share/ubiquity-slideshow/slides/l10n/ug/ is in ubiquity-slideshow-kubuntu 83.
This file is owned by root:root, with mode 0o755.
..
/usr/share/ubiquity-slideshow/slides/l10n/ug/accessibility.html
/usr/share/ubiquity-slideshow/slides/l10n/ug/games.html
/usr/share/ubiquity-slideshow/slides/l10n/ug/get-help.html
/usr/share/ubiquity-slideshow/slides/l10n/ug/get-involved.html
/usr/share/ubiquity-slideshow/slides/l10n/ug/graphics.html
/usr/share/ubiquity-slideshow/slides/l10n/ug/installing-software.html
/usr/share/ubiquity-slideshow/slides/l10n/ug/internet.html
/usr/share/ubiquity-slideshow/slides/l10n/ug/multimedia.html
/usr/share/ubiquity-slideshow/slides/l10n/ug/office.html
/usr/share/ubiquity-slideshow/slides/l10n/ug/pim.html
/usr/share/ubiquity-slideshow/slides/l10n/ug/welcome.html