ubuntu pdf jp fonts

install poppler-data

create ".fonts.conf" file under home directory with following contents

<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
<match target="pattern">

 <test qual="any" name="family">
     <string>sans-serif</string>
 </test>
 <edit name="family" mode="prepend" binding="strong">
    <string>Takao ExGothic</string>
 </edit>
</match>

</fontconfig>