/usr/share/ is in cantor-backend-maxima 4:4.13.0-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/icons/
/usr/share/icons/hicolor/
/usr/share/icons/hicolor/48x48/
/usr/share/icons/hicolor/48x48/apps/
/usr/share/icons/hicolor/48x48/apps/maximabackend.png
/usr/share/kde4/
/usr/share/kde4/services/
/usr/share/kde4/services/cantor/
/usr/share/kde4/services/cantor/maximabackend.desktop
/usr/share/kde4/apps/
/usr/share/kde4/apps/cantor/
/usr/share/kde4/apps/cantor/maximabackend/
/usr/share/kde4/apps/cantor/maximabackend/cantor-initmaxima.lisp
/usr/share/kde4/apps/cantor/maximabackend/keywords.xml
/usr/share/kde4/config/
/usr/share/kde4/config/cantor_maxima.knsrc
/usr/share/kde4/config.kcfg/
/usr/share/kde4/config.kcfg/maximabackend.kcfg
/usr/share/doc/
/usr/share/doc/cantor-backend-maxima/
/usr/share/doc/cantor-backend-maxima/copyright
/usr/share/doc/cantor-backend-maxima/changelog.Debian.gz