/usr/share/stellarium/skycultures/siberian/ is in stellarium-data 0.15.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/stellarium/skycultures/siberian/constellation_names.eng.fab
/usr/share/stellarium/skycultures/siberian/constellations_boundaries.dat
/usr/share/stellarium/skycultures/siberian/constellationship.fab
/usr/share/stellarium/skycultures/siberian/description.be.utf8
/usr/share/stellarium/skycultures/siberian/description.bn.utf8
/usr/share/stellarium/skycultures/siberian/description.en.utf8
/usr/share/stellarium/skycultures/siberian/description.hu.utf8
/usr/share/stellarium/skycultures/siberian/description.pt_BR.utf8
/usr/share/stellarium/skycultures/siberian/description.ru.utf8
/usr/share/stellarium/skycultures/siberian/description.uk.utf8
/usr/share/stellarium/skycultures/siberian/info.ini
/usr/share/stellarium/skycultures/siberian/planet_names.fab
/usr/share/stellarium/skycultures/siberian/star_names.fab