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Ubuntu11.10 E: Unable to locate package ubuntu-restricted-extras
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：
1 01.Ign http://extras.ubuntu.com natty/main TranslationIndex 2 02.Err http://extras.ubuntu.com natty/main Sources 3 03. 404 Not Found 4 04.Err http://extras.ubuntu.com natty/main i386 Packages 5 05. 404 Not Found 6 06.Ign http://extras.ubuntu.com natty/main Translation-en_US 7 07.Err http://security.ubuntu.com natty-security/universe Sources 8 08. 404 Not Found [IP: 91.189.92.200 80] 9 09.Err http://security.ubuntu.com natty-security/multiverse Sources 10 10. 404 Not Found [IP: 91.189.92.200 80] 11 11.Ign http://extras.ubuntu.com natty/main Translation-en 12 12.Err http://security.ubuntu.com natty-security/universe i386 Packages 13 13. 404 Not Found [IP: 91.189.92.200 80] 14 14.Err http://security.ubuntu.com natty-security/multiverse i386 Packages 15 15. 404 Not Found [IP: 91.189.92.200 80] 16 16.Err http://security.ubuntu.com natty-security/main Sources 17 17. 404 Not Found [IP: 91.189.92.200 80] 18 18.Err http://security.ubuntu.com natty-security/restricted Sources 19 19. 404 Not Found [IP: 91.189.92.200 80] 20 20.Err http://security.ubuntu.com natty-security/main i386 Packages 21 21. 404 Not Found [IP: 91.189.92.200 80] 22 22.Err http://security.ubuntu.com natty-security/restricted i386 Packages 23 23. 404 Not Found [IP: 91.189.92.200 80] 24 24.Ign http://security.ubuntu.com natty-security/main Translation-en_US 25 25.Ign http://security.ubuntu.com natty-security/main Translation-en 26 26.Ign http://security.ubuntu.com natty-security/multiverse Translation-en_US 27 27.Ign http://security.ubuntu.com natty-security/multiverse Translation-en 28 28.Ign http://security.ubuntu.com natty-security/restricted Translation-en_US 29 29.Ign http://security.ubuntu.com natty-security/restricted Translation-en 30 30.Ign http://security.ubuntu.com natty-security/universe Translation-en_US 31 31.Ign http://security.ubuntu.com natty-security/universe Translation-en 32 32.W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty/main/source/Sources 404 Not Found 33 33. 34 34.W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty/restricted/source/Sources 404 Not Found 35 35. 36 36.W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty/universe/source/Sources 404 Not Found 37 37. 38 38.W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty/multiverse/source/Sources 404 Not Found 39 39. 40 40.W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty/main/binary-i386/Packages 404 Not Found 41 41. 42 42.W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty/restricted/binary-i386/Packages 404 Not Found 43 43. 44 44.W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty/universe/binary-i386/Packages 404 Not Found 45 45. 46 46.W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty/multiverse/binary-i386/Packages 404 Not Found 47 47. 48 48.W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty-updates/main/source/Sources 404 Not Found 49 49. 50 50.W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty-updates/restricted/source/Sources 404 Not Found 51 51. 52 52.W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty-updates/universe/source/Sources 404 Not Found 53 53. 54 54.W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty-updates/multiverse/source/Sources 404 Not Found 55 55. 56 56.W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty-updates/main/binary-i386/Packages 404 Not Found 57 57. 58 58.W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty-updates/restricted/binary-i386/Packages 404 Not Found 59 59. 60 60.W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty-updates/universe/binary-i386/Packages 404 Not Found 61 61. 62 62.W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty-updates/multiverse/binary-i386/Packages 404 Not Found 63 63. 64 64.W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/natty-security/universe/source/Sources 404 Not Found [IP: 91.189.92.200 80] 65 65. 66 66.W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/natty-security/multiverse/source/Sources 404 Not Found [IP: 91.189.92.200 80] 67 67. 68 68.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] 69 69. 70 70.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] 71 71. 72 72.W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/natty-security/main/source/Sources 404 Not Found [IP: 91.189.92.200 80] 73 73. 74 74.W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/natty-security/restricted/source/Sources 404 Not Found [IP: 91.189.92.200 80] 75 75. 76 76.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] 77 77. 78 78.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] 79 79. 80 80.W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/natty/main/source/Sources 404 Not Found 81 81. 82 82.W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/natty/main/binary-i386/Packages 404 Not Found 83 83. 84 84.E: Some index files failed to download. They have been ignored, or old ones used instead. 85 85.chaihuasong@chaihuasong:~$ sudo apt-get install git 86 86.Reading package lists... Done 87 87.Building dependency tree 88 88.Reading state information... Done 89 89.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。
1 deb http://mirrors.163.com/ubuntu/ lucid main restricted universe multiverse 2 deb http://mirrors.163.com/ubuntu/ lucid-security main restricted universe multiverse 3 deb http://mirrors.163.com/ubuntu/ lucid-updates main restricted universe multiverse 4 deb http://mirrors.163.com/ubuntu/ lucid-proposed main restricted universe multiverse 5 deb http://mirrors.163.com/ubuntu/ lucid-backports main restricted universe multiverse 6 deb-src http://mirrors.163.com/ubuntu/ lucid main restricted universe multiverse 7 deb-src http://mirrors.163.com/ubuntu/ lucid-security main restricted universe multiverse 8 deb-src http://mirrors.163.com/ubuntu/ lucid-updates main restricted universe multiverse 9 deb-src http://mirrors.163.com/ubuntu/ lucid-proposed main restricted universe multiverse10 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！
Ubuntu11.10 E: Unable to locate package ubuntu-restricted-extras
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