我不清楚是怎么回事，浏览器可以上网，GAIM也能用
惟独我用sudo apt-get update 或者新立得的时候，无法连接上任何一个资源
我觉得不是资源的问题，因为我用光盘启动了一回，发现可以连上这些源
而且我刚刚刚刚重新装了一遍系统，还是有问题，我就不懂了…请高手指点啊！！感谢万分！！
我最最最最 纳闷的就是为什么用光盘LIVE启动时候能连上更新源，装了系统就不行了。太崩溃了。高手帮我啊！！！！
附：apt-get update时候的返回值：
apt-get update
Err http://archive.ubuntu.com dapper Release.gpg
Connection failed [IP: 195.248.90.54 80]
Ign http://archive.ubuntu.com dapper Release
Ign http://archive.ubuntu.com dapper/main Packages
Ign http://archive.ubuntu.com dapper/restricted Packages
Err http://archive.ubuntu.com dapper/main Packages
Connection failed [IP: 195.248.90.54 80]
Err http://archive.ubuntu.com dapper/restricted Packages
Connection failed [IP: 195.248.90.54 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dis...er/Release.gpg Connection failed [IP: 195.248.90.54 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dis...64/Packages.gz Connection failed [IP: 195.248.90.54 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dis...64/Packages.gz Connection failed [IP: 195.248.90.54 80]
Reading package lists... Done
E: Some index files failed to download, they have been ignored, or old ones used instead.
还有我进系统的时候总是提示无法启动HAL，求解。