Comment 8 for bug 167353

Inkscape should not use the Style tag of the font for
anything but for what name to use for the user interface.
The backend should use the stretch/width and the weight
information to differentiate between the fonts. Style can be
anything, from standard names to totally arbitrary ones,
weights are a finite set and stretch width too.

For Lucida Sans Demibold you could rename the font to one
style that Inkscape currently support. Fontforge can do that
but I doubt this procedure is legal.