Depois de ter instalado novas fontes no sistema é importante atualizar o cache. É só abrir o terminal e digitar sudo fc-cache -vf:
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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 ~ $
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Pronto, agora voce verá as fontes nos programas sem ter que reiniciar o sistema 😉