/usr/share/ubiquity-slideshow/slides/l10n/ca/ is in ubiquity-slideshow-ubuntu 83.
This file is owned by root:root, with mode 0o755.
..
/usr/share/ubiquity-slideshow/slides/l10n/ca/accessibility.html
/usr/share/ubiquity-slideshow/slides/l10n/ca/browse.html
/usr/share/ubiquity-slideshow/slides/l10n/ca/gethelp.html
/usr/share/ubiquity-slideshow/slides/l10n/ca/music.html
/usr/share/ubiquity-slideshow/slides/l10n/ca/office.html
/usr/share/ubiquity-slideshow/slides/l10n/ca/photos.html
/usr/share/ubiquity-slideshow/slides/l10n/ca/usc.html
/usr/share/ubiquity-slideshow/slides/l10n/ca/welcome.html
/usr/share/ubiquity-slideshow/slides/l10n/ca@valencia/accessibility.html
/usr/share/ubiquity-slideshow/slides/l10n/ca@valencia/browse.html
/usr/share/ubiquity-slideshow/slides/l10n/ca@valencia/gethelp.html
/usr/share/ubiquity-slideshow/slides/l10n/ca@valencia/music.html
/usr/share/ubiquity-slideshow/slides/l10n/ca@valencia/office.html
/usr/share/ubiquity-slideshow/slides/l10n/ca@valencia/photos.html
/usr/share/ubiquity-slideshow/slides/l10n/ca@valencia/usc.html
/usr/share/ubiquity-slideshow/slides/l10n/ca@valencia/welcome.html