Default Font (FreeSerif) on linux and changing fonts
It looks like musescore 2.0.3 on linux, at least on debian stretch (next stable, to be released), does not like default FreeSerif font. The thing is that MS always chooses bold version of this font, so changing bold/regular has no effect, all chars are always in bold. After turning on italics, I can set bold/non-bold and it works fine. Other fonts works fine too, at least about 20 other fonts installed on my system. But the default FreeSerif can't be made regular. And only in musescore, other programs (browsers, word processors, other things) are fine with this font.
So the question is either what to do with this font to let MS to be aware of regular version of it, or how to change fonts everywhere so some other font will be used (eg DejaVu Serif) instead of the default, in all places of a given score, and in other scores as well. Changing font for every element manually is quite a lot of work.