Edit file File name : 49-sansserif.conf Content :<?xml version="1.0"?> <!DOCTYPE fontconfig SYSTEM "fonts.dtd"> <fontconfig> <its:rules xmlns:its="http://www.w3.org/2005/11/its" version="1.0"> <its:translateRule translate="no" selector="/fontconfig/*[not(self::description)]"/> </its:rules> <description>Add sans-serif to the family when no generic name</description> <!-- If the font still has no generic name, add sans-serif --> <match target="pattern"> <test qual="all" name="family" compare="not_eq"> <string>sans-serif</string> </test> <test qual="all" name="family" compare="not_eq"> <string>serif</string> </test> <test qual="all" name="family" compare="not_eq"> <string>monospace</string> </test> <edit name="family" mode="append_last"> <string>sans-serif</string> </edit> </match> </fontconfig> Save