最近在ubuntu11.10下安装支持多媒体播放的插件时遇到一些问题，在此小记一下。

首先是ubuntu11.10的安装，基本上是一键安装，在此不细说。

1.此版本和以前使用的ubuntu版本风格不太一致，为此在使用时一度不太习惯。

1）软件源服务器的选择

在左侧列表中有一个System  Settings,点击进入有3大选项，选择System里面的Software Sources，出现一个对话框，第一项为Ubuntu Software，此项里有一个DownLoad From选择中国服务器mirrors.163.com（网易）服务源，保存退出。

2）终端的使用

终端的使用不在像以前的版本一样，直接右键桌面就可以出现。Ubuntu11.10使用快捷键Ctrl+Atrl+T，然后可以将终端锁定在左侧的菜单栏里，方便使用。

2.安装插件

使用命令

sudo apt-get install ubuntu-restricted-extras
时出现错误：
E: Unable to locate package ubuntu-restricted-extras
即找不到安装的包，在网上找资料，得到的答案是
sudo apt-get update
sudo apt-get upgrade
在使用sudo apt-get update命令时遇到问题
E: Unable to lock directory /var/lib/apt/lists/
查资料得到方法：
sudo rm /var/lib/apt/lists/lock
测试通过！
在sudo apt-get update的过程中遇到问题：
 .Ign http://extras.ubuntu.com natty/main TranslationIndex

 .Err http://extras.ubuntu.com natty/main Sources

 .    Not Found

 .Err http://extras.ubuntu.com natty/main i386 Packages

 .    Not Found

 .Ign http://extras.ubuntu.com natty/main Translation-en_US

 .Err http://security.ubuntu.com natty-security/universe Sources

 .    Not Found [IP: 91.189.92.200 ]

 .Err http://security.ubuntu.com natty-security/multiverse Sources

 .    Not Found [IP: 91.189.92.200 ]

 .Ign http://extras.ubuntu.com natty/main Translation-en

 .Err http://security.ubuntu.com natty-security/universe i386 Packages

 .    Not Found [IP: 91.189.92.200 ]

 .Err http://security.ubuntu.com natty-security/multiverse i386 Packages

 .    Not Found [IP: 91.189.92.200 ]

 .Err http://security.ubuntu.com natty-security/main Sources

 .    Not Found [IP: 91.189.92.200 ]

 .Err http://security.ubuntu.com natty-security/restricted Sources

 .    Not Found [IP: 91.189.92.200 ]

 .Err http://security.ubuntu.com natty-security/main i386 Packages

 .    Not Found [IP: 91.189.92.200 ]

 .Err http://security.ubuntu.com natty-security/restricted i386 Packages

 .    Not Found [IP: 91.189.92.200 ]

 .Ign http://security.ubuntu.com natty-security/main Translation-en_US

 .Ign http://security.ubuntu.com natty-security/main Translation-en

 .Ign http://security.ubuntu.com natty-security/multiverse Translation-en_US

 .Ign http://security.ubuntu.com natty-security/multiverse Translation-en

 .Ign http://security.ubuntu.com natty-security/restricted Translation-en_US

 .Ign http://security.ubuntu.com natty-security/restricted Translation-en

 .Ign http://security.ubuntu.com natty-security/universe Translation-en_US

 .Ign http://security.ubuntu.com natty-security/universe Translation-en

 .W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty/main/source/Sources  404  Not Found

 .

 .W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty/restricted/source/Sources  404  Not Found

 .

 .W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty/universe/source/Sources  404  Not Found

 .

 .W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty/multiverse/source/Sources  404  Not Found

 .

 .W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty/main/binary-i386/Packages  404  Not Found

 .

 .W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty/restricted/binary-i386/Packages  404  Not Found

 .

 .W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty/universe/binary-i386/Packages  404  Not Found

 .

 .W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty/multiverse/binary-i386/Packages  404  Not Found

 .

 .W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty-updates/main/source/Sources  404  Not Found

 .

 .W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty-updates/restricted/source/Sources  404  Not Found

 .

 .W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty-updates/universe/source/Sources  404  Not Found

 .

 .W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty-updates/multiverse/source/Sources  404  Not Found

 .

 .W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty-updates/main/binary-i386/Packages  404  Not Found

 .

 .W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty-updates/restricted/binary-i386/Packages  404  Not Found

 .

 .W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty-updates/universe/binary-i386/Packages  404  Not Found

 .

 .W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty-updates/multiverse/binary-i386/Packages  404  Not Found

 .

 .W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/natty-security/universe/source/Sources  404  Not Found [IP: 91.189.92.200 80]

 .

 .W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/natty-security/multiverse/source/Sources  404  Not Found [IP: 91.189.92.200 80]

 .

 .W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/natty-security/universe/binary-i386/Packages  404  Not Found [IP: 91.189.92.200 80]

 .

 .W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/natty-security/multiverse/binary-i386/Packages  404  Not Found [IP: 91.189.92.200 80]

 .

 .W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/natty-security/main/source/Sources  404  Not Found [IP: 91.189.92.200 80]

 .

 .W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/natty-security/restricted/source/Sources  404  Not Found [IP: 91.189.92.200 80]

 .

 .W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/natty-security/main/binary-i386/Packages  404  Not Found [IP: 91.189.92.200 80]

 .

 .W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/natty-security/restricted/binary-i386/Packages  404  Not Found [IP: 91.189.92.200 80]

 .

 .W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/natty/main/source/Sources  404  Not Found

 .

 .W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/natty/main/binary-i386/Packages  404  Not Found

 .

 .E: Some index files failed to download. They have been ignored, or old ones used instead.

 .chaihuasong@chaihuasong:~$ sudo apt-get install git

 .Reading package lists... Done

 .Building dependency tree

 .Reading state information... Done

 .E: Unable to locate package git

继续找资料，在chaihuasong的博客里名为ubuntu下sudo apt-get update Sources 404 Not Found [IP: 91.189.92.200 80]解决办法

里获得答案：

把以下内容复制、粘贴到etc/apt/sources.list文件里的最开始部分，保存并退出。

 deb http://mirrors.163.com/ubuntu/ lucid main restricted universe multiverse

 deb http://mirrors.163.com/ubuntu/ lucid-security main restricted universe multiverse

 deb http://mirrors.163.com/ubuntu/ lucid-updates main restricted universe multiverse

 deb http://mirrors.163.com/ubuntu/ lucid-proposed main restricted universe multiverse

 deb http://mirrors.163.com/ubuntu/ lucid-backports main restricted universe multiverse

 deb-src http://mirrors.163.com/ubuntu/ lucid main restricted universe multiverse

 deb-src http://mirrors.163.com/ubuntu/ lucid-security main restricted universe multiverse

 deb-src http://mirrors.163.com/ubuntu/ lucid-updates main restricted universe multiverse

 deb-src http://mirrors.163.com/ubuntu/ lucid-proposed main restricted universe multiverse

 deb-src http://mirrors.163.com/ubuntu/ lucid-backports main restricted universe multiverse

测试通过。（虽然在更新的过程中仍然有提示很多package失败和错误）

然后使用命令：

sudo apt-get update

sudo apt-get upgrade

sudo apt-get install ubuntu-restricted-extras

即支持多媒体播放的插件安装成功！

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