今天用sudo apt-get install flex的時候出現了標題上的問題，不能連接。

先ping了一下這個域名，發現能夠ping的通，就是不懂為什么不能鏈接。

接著從網上找相應的解決方法，有網友說是源出問題拉，權且認為是這個源的主機down了。

然后從網上搜到與OS相對應的版本的源，我的是10.04,然后更改了源，就沒問題了。

具體如下：

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

??? 刪除原有內容

2. 將下面的源中選擇一個，最好是物理上位置比較近的，這樣連接速度快。復制到source.list中去。

Ubuntu 10.04源列表：

網易（速度很快）

代碼: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
代碼: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
代碼: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
代碼: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. 運行一下sudo apt-get update

這樣問題就能解決了

總結

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