ubuntu软件更新源，提高更新速度

更新源方法：

1. 打开终端。单击主菜单中的“应用程序 -- 附件 -- 终端”。

2. 修改更新服务器列表。请在终端中执行下面的两条命令：

备份更新源：

   sudo cp /etc/apt/sources.list /etc/apt/sources.list_backup 

还原更新源：

  sudo cp /etc/apt/sources.list_backup /etc/apt/sources.list 

 用gedit打开sources.list文件

   sudo gedit /etc/apt/sources.list

   在接下来在打开的文本编辑器中，把看到的内容全部删掉，在Ubuntu11.04源列表里选择一组对于你来说速度最快的更新服务器列表。粘贴到你所看到的窗口中。推荐台湾源和网易源，更新软件的速度很快！

4. 关闭文本编辑器。

5. 更新软件包列表。执行下面的命令： 

   sudo apt-get update

6. 安装系统更新 

    打开“系统->系统管理->更新管理器”，安装更新。完成后若系统提示重新启动，请重新启动系统。 

下面是Ubuntu 11.04一些常见的源

#Ubuntu官方源

deb http://cn.archive.Ubuntu.com/ubuntu/ natty multiverse

deb-src http://cn.archive.Ubuntu.com/ubuntu/ natty multiverse

deb http://cn.archive.Ubuntu.com/ubuntu/ natty-updates multiverse

deb-src http://cn.archive.Ubuntu.com/ubuntu/ natty-updates multiverse

deb http://security.Ubuntu.com/ubuntu natty-security main restricted

deb-src http://security.Ubuntu.com/ubuntu natty-security main restricted

deb http://security.Ubuntu.com/ubuntu natty-security universe

deb-src http://security.Ubuntu.com/ubuntu natty-security universe

deb http://security.Ubuntu.com/ubuntu natty-security multiverse

deb-src http://security.Ubuntu.com/ubuntu natty-security multiverse

deb http://archive.canonical.com/Ubuntu natty partner

deb-src http://archive.canonical.com/Ubuntu natty partner

#Ubuntu 11.04台湾源（推荐）

deb http://tw.archive.Ubuntu.com/ubuntu/ natty main universe restricted multiverse

deb-src http://tw.archive.Ubuntu.com/ubuntu/ natty main universe restricted multiverse

deb http://tw.archive.Ubuntu.com/ubuntu/ natty-security universe main multiverse restricted

deb-src http://tw.archive.Ubuntu.com/ubuntu/ natty-security universe main multiverse restricted

deb http://tw.archive.Ubuntu.com/ubuntu/ natty-updates universe main multiverse restricted

deb-src http://tw.archive.Ubuntu.com/ubuntu/ natty-updates universe main multiverse restricted

#Ubuntu11.04网易源（速度很快、推荐）

deb http://mirrors.163.com/Ubuntu/ natty main universe restricted multiverse

deb-src http://mirrors.163.com/Ubuntu/ natty main universe restricted multiverse

deb http://mirrors.163.com/Ubuntu/ natty-security universe main multiverse restricted

deb-src http://mirrors.163.com/Ubuntu/ natty-security universe main multiverse restricted

deb http://mirrors.163.com/Ubuntu/ natty-updates universe main multiverse restricted

deb http://mirrors.163.com/Ubuntu/ natty-proposed universe main multiverse restricted

deb-src http://mirrors.163.com/Ubuntu/ natty-proposed universe main multiverse restricted

deb http://mirrors.163.com/Ubuntu/ natty-backports universe main multiverse restricted

deb-src http://mirrors.163.com/Ubuntu/ natty-backports universe main multiverse restricted

deb-src http://mirrors.163.com/Ubuntu/ natty-updates universe main multiverse restricted

#Ubuntu11.04上海源

deb http://mirror.rootguide.org/Ubuntu/ natty main universe restricted multiverse

deb-src http://mirror.rootguide.org/Ubuntu/ natty main universe restricted multiverse

deb http://mirror.rootguide.org/Ubuntu/ natty-security universe main multiverse restricted

deb-src http://mirror.rootguide.org/Ubuntu/ natty-security universe main multiverse restricted

deb http://mirror.rootguide.org/Ubuntu/ natty-updates universe main multiverse restricted

deb http://mirror.rootguide.org/Ubuntu/ natty-proposed universe main multiverse restricted

deb-src http://mirror.rootguide.org/Ubuntu/ natty-proposed universe main multiverse restricted

deb http://mirror.rootguide.org/Ubuntu/ natty-backports universe main multiverse restricted

deb-src http://mirror.rootguide.org/Ubuntu/ natty-backports universe main multiverse restricted

deb-src http://mirror.rootguide.org/Ubuntu/ natty-updates universe main multiverse restricted