Как установить wps office через flatpak в ubuntu 19.04?

Flatpak имеет новейшее программное обеспечение, чем оснастки. Я попытался установить wps office через flatpak, но не получилось.

router@router:~$ flatpak install flathub com.wps.Office

Note that the directories 

'/var/lib/flatpak/exports/share'
'/home/router/.local/share/flatpak/exports/share'

are not in the search path set by the XDG_DATA_DIRS environment variable, so
applications installed by Flatpak may not appear on your desktop until the
session is restarted.

Looking for matches…
error: No remote refs found similar to ‘flathub’
router@router:~$