Do you happen to know a font closest to Calibri regular in Scribus please? It so happens Scribus does not embed Calibri no matter what I do. I guess it's asking me to "GO FIND ANOTHER FONT". >:(
That's odd, Calibri's license says it allows editing (which implies embedding if I'm not mistaken).
For a similar font which is free, you might look at Fontin Sans (http://www.exljbris.com/fontinsans.html).