在使用ubuntu中安装package的时候，常常会遇到查找不到包的情况，多半是因为没有执行apt-get update, 而原生ubuntu系统的安

装源估计被墙了，所以得换成国内的源。

ubuntu12.04添加国内软件源（163、sohu、ustc），编辑sources.list文件
sudo gedit /etc/apt/sources.list
添加如下内容，保存然后sudo apt-get update.
如果是其它ubuntu版本，只需把precise改为相应的版本的名字。hardy(8.04),lucid(10.04),maverick(10.10),oneiric(11.10),quantal(12.10),precise(12.04)


#163
deb http://mirrors.163.com/ubuntu/ precise main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ precise-security main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ precise-updates main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ precise-proposed main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ precise-backports main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ precise main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ precise-security main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ precise-updates main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ precise-proposed main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/precise-backports main restricted universe multiverse
#sohu
deb http://mirrors.sohu.com/ubuntu/ precise main restricted universe multiverse
deb http://mirrors.sohu.com/ubuntu/ precise-security main restricted universe multiverse
deb http://mirrors.sohu.com/ubuntu/ precise-updates main restricted universe multiverse
deb http://mirrors.sohu.com/ubuntu/ precise-proposed main restricted universe multiverse
deb http://mirrors.sohu.com/ubuntu/ precise-backports main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ precise main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ precisec-security main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ precise-updates main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ precise-proposed main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ precise-backports main restricted universe multiverse
#ustc
deb http://mirrors.ustc.edu.cn/ubuntu/ precise main restricted universe multiverse
deb http://mirrors.ustc.edu.cn/ubuntu/ precise-security main restricted universe multiverse
deb http://mirrors.ustc.edu.cn/ubuntu/ precise-updates main restricted universe multiverse
deb http://mirrors.ustc.edu.cn/ubuntu/ precise-proposed main restricted universe multiverse
deb http://mirrors.ustc.edu.cn/ubuntu/ precise-backports main restricted universe multiverse
deb-src http://mirrors.ustc.edu.cn/ubuntu/ precise main restricted universe multiverse
deb-src http://mirrors.ustc.edu.cn/ubuntu/ precise-security main restricted universe multiverse
deb-src http://mirrors.ustc.edu.cn/ubuntu/ precise-updates main restricted universe multiverse
deb-src http://mirrors.ustc.edu.cn/ubuntu/ precise-proposed main restricted universe multiverse
deb-src http://mirrors.ustc.edu.cn/ubuntu/ precise-backports main restricted universe multiverse

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