解决Ubuntu 安装vim 的Package vim has no installation candidate

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      解决Ubuntu 安装vim 的Package vim has no installation candidate问题  解决办法：
    1、备份源文件，cp -i /etc/apt/sources.list /etc/apt/sources.list_backup
    2、打开sources.list，root@ubuntu:/opt# gedit /etc/apt/sources.list
    3、在源文件中加入如下阿里巴巴的阿里云服务器的地址并保存
deb http://mirrors.aliyun.com/ubuntu/ trusty main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ trusty-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ trusty-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ trusty-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ trusty main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-security main restricted universe multiverse

deb-src http://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-backports main restricted universe multiverse

    4、更新：sudo apt-get update

    5、更新后，再安装vim，sudo apt-get install vim