E: Package 'openswan' has no installation candidate

解决办法:
1.vi /etc/apt/sources.list.d/lzu.list (没有lzu.list这个文件的话,会增加这个文件)
编辑,添加如下内容,保存退出

deb http://mirror.lzu.edu.cn/ubuntu/ precise main restricted universe multiverse
deb http://mirror.lzu.edu.cn/ubuntu/ precise-security main restricted universe multiverse
deb http://mirror.lzu.edu.cn/ubuntu/ precise-updates main restricted universe multiverse
deb http://mirror.lzu.edu.cn/ubuntu/ precise-proposed main restricted universe multiverse
deb http://mirror.lzu.edu.cn/ubuntu/ precise-backports main restricted universe multiverse
deb-src http://mirror.lzu.edu.cn/ubuntu/ precise main restricted universe multiverse
deb-src http://mirror.lzu.edu.cn/ubuntu/ precise-security main restricted universe multiverse
deb-src http://mirror.lzu.edu.cn/ubuntu/ precise-updates main restricted universe multiverse
deb-src http://mirror.lzu.edu.cn/ubuntu/ precise-proposed main restricted universe multiverse
deb-src http://mirror.lzu.edu.cn/ubuntu/ precise-backports main restricted universe multiverse

2.更新
sudo apt-get update

3.安装
apt-get install openswan

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