在使用createlang 安装plpythonu的时候出现如下错误：
could not open extension control file "/usr/share/postgresql/9.1/extension/plpythonu.control": No such file or directorycould not op
阅读背景：
could not open extension control file "/usr/share/postgresql/9.1/extension/plpythonu.control": No such file or directory
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