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今天用sudo apt-get install flex的时候出现了标题上的问题，不能连接。

先ping了一下这个域名，发现能够ping的通，就是不懂为什么不能链接。

接着从网上找相应的解决方法，有网友说是源出问题拉，权且认为是这个源的主机down了。

然后从网上搜到与OS相对应的版本的源，我的是10.04,然后更改了源，就没问题了。

具体如下：

1. sudo gedit /etc/apt/source.list

    删除原有内容

2. 将下面的源中选择一个，最好是物理上位置比较近的，这样连接速度快。复制到source.list中去。

Ubuntu 10.04源列表：

网易（速度很快）

代码:deb http://mirrors.163.com/ubuntu/ lucid main universe restricted multiverse deb-src http://mirrors.163.com/ubuntu/ lucid main universe restricted multiverse deb http://mirrors.163.com/ubuntu/ lucid-security universe main multiverse restricted deb-src http://mirrors.163.com/ubuntu/ lucid-security universe main multiverse restricted deb http://mirrors.163.com/ubuntu/ lucid-updates universe main multiverse restricted deb http://mirrors.163.com/ubuntu/ lucid-proposed universe main multiverse restricted deb-src http://mirrors.163.com/ubuntu/ lucid-proposed universe main multiverse restricted deb http://mirrors.163.com/ubuntu/ lucid-backports universe main multiverse restricted deb-src http://mirrors.163.com/ubuntu/ lucid-backports universe main multiverse restricted deb-src http://mirrors.163.com/ubuntu/ lucid-updates universe main multiverse restricted 搜狐 代码:deb http://mirrors.shlug.org/ubuntu/ lucid main universe restricted multiverse deb-src http://mirrors.shlug.org/ubuntu/ lucid main universe restricted multiverse deb http://mirrors.shlug.org/ubuntu/ lucid-security universe main multiverse restricted deb-src http://mirrors.shlug.org/ubuntu/ lucid-security universe main multiverse restricted deb http://mirrors.shlug.org/ubuntu/ lucid-updates universe main multiverse restricted deb http://mirrors.shlug.org/ubuntu/ lucid-proposed universe main multiverse restricted deb-src http://mirrors.shlug.org/ubuntu/ lucid-proposed universe main multiverse restricted deb http://mirrors.shlug.org/ubuntu/ lucid-backports universe main multiverse restricted deb-src http://mirrors.shlug.org/ubuntu/ lucid-backports universe main multiverse restricted deb-src http://mirrors.shlug.org/ubuntu/ lucid-updates universe main multiverse restricted SRT Sources 代码:deb http://ubuntu.srt.cn/ubuntu/ lucid main restricted universe multiverse deb http://ubuntu.srt.cn/ubuntu/ lucid-security main restricted universe multiverse deb http://ubuntu.srt.cn/ubuntu/ lucid-updates main restricted universe multiverse deb http://ubuntu.srt.cn/ubuntu/ lucid-proposed main restricted universe multiverse deb http://ubuntu.srt.cn/ubuntu/ lucid-backports main restricted universe multiverse deb-src http://ubuntu.srt.cn/ubuntu/ lucid main restricted universe multiverse deb-src http://ubuntu.srt.cn/ubuntu/ lucid-security main restricted universe multiverse deb-src http://ubuntu.srt.cn/ubuntu/ lucid-updates main restricted universe multiverse deb-src http://ubuntu.srt.cn/ubuntu/ lucid-proposed main restricted universe multiverse deb-src http://ubuntu.srt.cn/ubuntu/ lucid-backports main restricted universe multiverse ubuntu官方上海源 代码:deb http://mirror.rootguide.org/ubuntu/ lucid main universe restricted multiverse deb-src http://mirror.rootguide.org/ubuntu/ lucid main universe restricted multiverse deb http://mirror.rootguide.org/ubuntu/ lucid-security universe main multiverse restricted deb-src http://mirror.rootguide.org/ubuntu/ lucid-security universe main multiverse restricted deb http://mirror.rootguide.org/ubuntu/ lucid-updates universe main multiverse restricted deb http://mirror.rootguide.org/ubuntu/ lucid-proposed universe main multiverse restricted deb-src http://mirror.rootguide.org/ubuntu/ lucid-proposed universe main multiverse restricted deb http://mirror.rootguide.org/ubuntu/ lucid-backports universe main multiverse restricted deb-src http://mirror.rootguide.org/ubuntu/ lucid-backports universe main multiverse restricted deb-src http://mirror.rootguide.org/ubuntu/ lucid-updates universe main multiverse restricted

3. 运行一下sudo apt-get update

这样问题就能解决了

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