打开终端输入sudo apt-get install xpdf-chinese-simplified和sudo apt-get install xpdf-chinese-traditional ,如果还是不行的话输入sudo apt-get install poppler-data来安装CJK中文字体 。若是其它语种的pdf文件安装相应的语言就可以了。
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关于Poppler :
Poppler is a PDF rendering library based on xpdf PDF viewer.
This package provides CJK fonts support for poppler.