Depois de ter instalado novas fontes no sistema é importante atualizar o cache. É só abrir o terminal e digitar sudo fc-cache -vf:
gunga ~ $ sudo fc-cache -vf /usr/share/fonts: caching, new cache contents: 1 fonts, 10 dirs /usr/share/fonts/100dpi: caching, new cache contents: 398 fonts, 0 dirs /usr/share/fonts/75dpi: caching, new cache contents: 398 fonts, 0 dirs /usr/share/fonts/OTF: caching, new cache contents: 208 fonts, 0 dirs /usr/share/fonts/TTF: caching, new cache contents: 659 fonts, 0 dirs /usr/share/fonts/Type1: caching, new cache contents: 38 fonts, 0 dirs /usr/share/fonts/cyrillic: caching, new cache contents: 0 fonts, 0 dirs /usr/share/fonts/encodings: caching, new cache contents: 0 fonts, 1 dirs /usr/share/fonts/encodings/large: caching, new cache contents: 0 fonts, 0 dirs /usr/share/fonts/local: caching, new cache contents: 28 fonts, 0 dirs /usr/share/fonts/misc: caching, new cache contents: 59 fonts, 0 dirs /usr/share/fonts/util: caching, new cache contents: 0 fonts, 0 dirs /home/gunga/.fonts: caching, new cache contents: 2 fonts, 0 dirs /home/gunga/.Fontmatrix/Activated: caching, new cache contents: 0 fonts, 0 dirs /var/cache/fontconfig: cleaning cache directory /home/gunga/.fontconfig: cleaning cache directory fc-cache: succeeded gunga ~ $
Pronto, agora voce verá as fontes nos programas sem ter que reiniciar o sistema 
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