我运行sudo apt-get update但它返回：
E: Malformed line 61 in source list /etc/apt/sources.list (dist parse) E: The list of sources could not be read.
我通过vim /etc/apt/sources.list打开sources.list
第61行是： deb http://apt.postgresql.org/pub/repos/apt/precise-pgdg main
我不确定这是什么错误的。
apt/之后缺less一个空格
http://apt.postgresql.org/pub/repos/apt/ precise-pgdg