Ubuntu 里 flash 中的汉字显示为框框

<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
<!--
  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</string>
      </edit>
   </match>
</fontconfig>