Ubuntu10.10 document viewer PDF Chinese garbled Problem

Garbled Chinese characters appear when you use document Viewer (2.24.1) to view PDF files in ubuntu10.10
1. Modify the ACL of the font setting file in terminal and enter sudo chmod 777/etc/fonts/CONF. d/49-sansserif.conf.

2. In terminal, enter sudo gedit/etc/fonts/CONF. d/49-sansserif.conf and modify the font setting to OK.

For example, I changed the font of the last and fourth lines to the font of Chinese characters.
<? 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> wenquanyi zhenghei </string>
</Edit>
</Match>
</Fontconfig>