http://blog.csdn.net/chaihuasong/article/details/17009641

最近在ubuntu 10.04下面装了一个虚拟机，在虚拟机里面又装了11.04的ubuntu，装好后用apt get install 出现Unable to locate packag错误，上网上查了下，说是要sudo apt-get update 就可以了，但是本地执行sudo apt-get update 命令后出现了如下错误：

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

发现很多源找不到，需要重新寻找更新源，最后把/etc/apt/sources.list文件中的地址换成我10.04中的etc/apt/sources.list文件后再执行sudo apt-get update 后就成功了，先贴上10.04上的source.list内容，如需要，直接替换即可

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 

发现了这个源超级快的，是网易163更新服务器，亲测可用

另外附上
搜狐更新服务器：

deb http://mirrors.sohu.com/ubuntu/ lucid main restricted universe multiverse
deb http://mirrors.sohu.com/ubuntu/ lucid-security main restricted universe multiverse
deb http://mirrors.sohu.com/ubuntu/ lucid-updates main restricted universe multiverse
deb http://mirrors.sohu.com/ubuntu/ lucid-proposed main restricted universe multiverse
deb http://mirrors.sohu.com/ubuntu/ lucid-backports main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ lucid main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ lucid-security main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ lucid-updates main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ lucid-proposed main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ lucid-backports main restricted universe multiverse 

这个速度也非常快，国内的源就是牛x啊～～