Thanks for the bug report. :p
Until it is fixed in the repository, you can edit /usr/share/xubuntu/session.sh and change: export XDG_DATA_DIRS=/etc/xdg/xdg-xubuntu to export XDG_DATA_DIRS="/etc/xdg/xdg-xubuntu:/usr/local/share"
Thanks for the bug report. :p
Until it is fixed in the repository, you can edit /usr/share/ xubuntu/ session. sh and change: DIRS=/etc/ xdg/xdg- xubuntu DIRS="/ etc/xdg/ xdg-xubuntu: /usr/local/ share"
export XDG_DATA_
to
export XDG_DATA_