Comment 17 for bug 45565

The default font is determined via the app prefs. You'll find the initial setting (for when no prefs yet exist) in the prefs loading code. Search for "scribus*.rc" . (This is certainly correct for Scribus 1.3.x, and I think it should be right for 1.2.x; I don't have 1.2.x code on hand to check and I'm on a shockingly expensive 'net connection at Uni so I have no desire to download it right now).

It's probably not a bad idea to define a font or set of fonts to prefer for the default font if no preferences already exist. Of course, it's much better not to ship broken fonts with the OS.