Ubuntu中文论坛

网站上所有的源都试了，都不能升级，但是通过网页浏览器都可以访问，不知道为什么？
比如cn99源，通过网页是可以访问的，但是：
xsl@xu:~$ sudo apt-get update
Ign http://ubuntu.cn99.com dapper Release.gpg
Ign http://ubuntu.cn99.com dapper-updates Release.gpg
Ign http://ubuntu.cn99.com dapper-security Release.gpg
Ign http://ubuntu.cn99.com dapper-backports Release.gpg
Ign http://ubuntu.cn99.com dapper Release.gpg
Ign http://ubuntu.cn99.com dapper Release
Ign http://ubuntu.cn99.com dapper-updates Release
Ign http://ubuntu.cn99.com dapper-security Release
Ign http://ubuntu.cn99.com dapper-backports Release
Ign http://ubuntu.cn99.com dapper Release
Ign http://ubuntu.cn99.com dapper/main Packages
Ign http://ubuntu.cn99.com dapper/restricted Packages
Ign http://ubuntu.cn99.com dapper/universe Packages
Ign http://ubuntu.cn99.com dapper/multiverse Packages
Ign http://ubuntu.cn99.com dapper-updates/main Packages
Ign http://ubuntu.cn99.com dapper-updates/restricted Packages
Ign http://ubuntu.cn99.com dapper-updates/universe Packages
Ign http://ubuntu.cn99.com dapper-updates/multiverse Packages
Ign http://ubuntu.cn99.com dapper-security/main Packages
Ign http://ubuntu.cn99.com dapper-security/restricted Packages
Ign http://ubuntu.cn99.com dapper-security/universe Packages
Ign http://ubuntu.cn99.com dapper-security/multiverse Packages
Ign http://ubuntu.cn99.com dapper-backports/main Packages
Ign http://ubuntu.cn99.com dapper-backports/restricted Packages
Ign http://ubuntu.cn99.com dapper-backports/universe Packages
Ign http://ubuntu.cn99.com dapper-backports/multiverse Packages
Ign http://ubuntu.cn99.com dapper/main Packages
Ign http://ubuntu.cn99.com dapper/restricted Packages
Ign http://ubuntu.cn99.com dapper/universe Packages
Ign http://ubuntu.cn99.com dapper/multiverse Packages
Err http://ubuntu.cn99.com dapper/main Packages
404 Not Found
Err http://ubuntu.cn99.com dapper/restricted Packages
404 Not Found
Err http://ubuntu.cn99.com dapper/universe Packages
404 Not Found
Err http://ubuntu.cn99.com dapper/multiverse Packages
404 Not Found
Err http://ubuntu.cn99.com dapper-updates/main Packages
404 Not Found
Err http://ubuntu.cn99.com dapper-updates/restricted Packages
404 Not Found
Err http://ubuntu.cn99.com dapper-updates/universe Packages
404 Not Found
Err http://ubuntu.cn99.com dapper-updates/multiverse Packages
404 Not Found
Err http://ubuntu.cn99.com dapper-security/main Packages
404 Not Found
Err http://ubuntu.cn99.com dapper-security/restricted Packages
404 Not Found
Err http://ubuntu.cn99.com dapper-security/universe Packages
404 Not Found
Err http://ubuntu.cn99.com dapper-security/multiverse Packages
404 Not Found
Err http://ubuntu.cn99.com dapper-backports/main Packages
404 Not Found
Err http://ubuntu.cn99.com dapper-backports/restricted Packages
404 Not Found
Err http://ubuntu.cn99.com dapper-backports/universe Packages
404 Not Found
Err http://ubuntu.cn99.com dapper-backports/multiverse Packages
404 Not Found
Err http://ubuntu.cn99.com dapper/main Packages
404 Not Found
Err http://ubuntu.cn99.com dapper/restricted Packages
404 Not Found
Err http://ubuntu.cn99.com dapper/universe Packages
404 Not Found
Err http://ubuntu.cn99.com dapper/multiverse Packages
404 Not Found
Failed to fetch http://ubuntu.cn99.com/ubuntu/dists/dap ... ackages.gz 404 Not Found
Failed to fetch http://ubuntu.cn99.com/ubuntu/dists/dap ... ackages.gz 404 Not Found
Failed to fetch http://ubuntu.cn99.com/ubuntu/dists/dap ... ackages.gz 404 Not Found
Failed to fetch http://ubuntu.cn99.com/ubuntu/dists/dap ... ackages.gz 404 Not Found
Failed to fetch http://ubuntu.cn99.com/ubuntu/dists/dap ... ackages.gz 404 Not Found
Failed to fetch http://ubuntu.cn99.com/ubuntu/dists/dap ... ackages.gz 404 Not Found
Failed to fetch http://ubuntu.cn99.com/ubuntu/dists/dap ... ackages.gz 404 Not Found
Failed to fetch http://ubuntu.cn99.com/ubuntu/dists/dap ... ackages.gz 404 Not Found
Failed to fetch http://ubuntu.cn99.com/ubuntu/dists/dap ... ackages.gz 404 Not Found
Failed to fetch http://ubuntu.cn99.com/ubuntu/dists/dap ... ackages.gz 404 Not Found
Failed to fetch http://ubuntu.cn99.com/ubuntu/dists/dap ... ackages.gz 404 Not Found
Failed to fetch http://ubuntu.cn99.com/ubuntu/dists/dap ... ackages.gz 404 Not Found
Failed to fetch http://ubuntu.cn99.com/ubuntu/dists/dap ... ackages.gz 404 Not Found
Failed to fetch http://ubuntu.cn99.com/ubuntu/dists/dap ... ackages.gz 404 Not Found
Failed to fetch http://ubuntu.cn99.com/ubuntu/dists/dap ... ackages.gz 404 Not Found
Failed to fetch http://ubuntu.cn99.com/ubuntu/dists/dap ... ackages.gz 404 Not Found
Failed to fetch http://ubuntu.cn99.com/ubuntu-cn/dists/ ... ackages.gz 404 Not Found
Failed to fetch http://ubuntu.cn99.com/ubuntu-cn/dists/ ... ackages.gz 404 Not Found
Failed to fetch http://ubuntu.cn99.com/ubuntu-cn/dists/ ... ackages.gz 404 Not Found
Failed to fetch http://ubuntu.cn99.com/ubuntu-cn/dists/ ... ackages.gz 404 Not Found
Reading package lists... Done
E: Some index files failed to download, they have been ignored, or old ones used instead.

谢谢左迟。
不过问题不在有没有使用脚本进行配置，现在是网络是通的，用浏览器能访问源，也能下载源里的文件。可以用apt-get就提示上面的错误，sources.list文件设置没有问题，刚刚重装好的6.06，不知道为什么？
有没有人遇到过这个问题啊？