Ubuntu中文论坛

My computer use proxy connect to the internet,sudo apt-get update said:

0% [Connecting to cn.archive.ubuntu.com] [Connecting to mirror.lupaworld.com] [Connecting to security.ubuntu.com]Errhttp://security.ubuntu.com dapper-security Release.gpg
Temporary failure resolving ‘security.ubuntu.com’
Errhttp://cn.archive.ubuntu.com dapper Release.gpg
Temporary failure resolving ‘cn.archive.ubuntu.com’
Errhttp://mirror.lupaworld.com dapper Release.gpg
Temporary failure resolving ‘mirror.lupaworld.com’
Errhttp://cn.archive.ubuntu.com dapper-security Release.gpg
Temporary failure resolving ‘cn.archive.ubuntu.com’
Errhttp://cn.archive.ubuntu.com dapper-updates Release.gpg
Temporary failure resolving ‘cn.archive.ubuntu.com’
Errhttp://cn.archive.ubuntu.com dapper-backports Release.gpg
Temporary failure resolving ‘cn.archive.ubuntu.com’
Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dis ... elease.gpg Temporary failure resolving ‘cn.archive.ubuntu.com’
Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dis ... elease.gpg Temporary failure resolving ‘cn.archive.ubuntu.com’
Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dis ... elease.gpg Temporary failure resolving ‘cn.archive.ubuntu.com’
Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dis ... elease.gpg Temporary failure resolving ‘cn.archive.ubuntu.com’
Failed to fetch http://mirror.lupaworld.com/ubuntu/ubun ... elease.gpg Temporary failure resolving ‘mirror.lupaworld.com’
Failed to fetch http://security.ubuntu.com/ubuntu/dists ... elease.gpg Temporary failure resolving ‘security.ubuntu.com’
Reading package lists... Done
W: Some index files failed to download, they have been ignored, or old ones used instead.jia@jia-desktop:~$
jia@jia-desktop:~$ sudo apt-get update
Errhttp://security.ubuntu.com dapper-security Release.gpg
Temporary failure resolving ‘security.ubuntu.com’
Errhttp://mirror.lupaworld.com dapper Release.gpg
Temporary failure resolving ‘mirror.lupaworld.com’
Errhttp://cn.archive.ubuntu.com dapper Release.gpg
Temporary failure resolving ‘cn.archive.ubuntu.com’
Errhttp://cn.archive.ubuntu.com dapper-security Release.gpg
Temporary failure resolving ‘cn.archive.ubuntu.com’
Errhttp://cn.archive.ubuntu.com dapper-updates Release.gpg
Temporary failure resolving ‘cn.archive.ubuntu.com’
Errhttp://cn.archive.ubuntu.com dapper-backports Release.gpg
Temporary failure resolving ‘cn.archive.ubuntu.com’
Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dis ... elease.gpg Temporary failure resolving ‘cn.archive.ubuntu.com’
Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dis ... elease.gpg Temporary failure resolving ‘cn.archive.ubuntu.com’
Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dis ... elease.gpg Temporary failure resolving ‘cn.archive.ubuntu.com’
Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dis ... elease.gpg Temporary failure resolving ‘cn.archive.ubuntu.com’
Failed to fetch http://mirror.lupaworld.com/ubuntu/ubun ... elease.gpg Temporary failure resolving ‘mirror.lupaworld.com’
Failed to fetch http://security.ubuntu.com/ubuntu/dists ... elease.gpg Temporary failure resolving ‘security.ubuntu.com’
Reading package lists... Done
W: Some index files failed to download, they have been ignored, or old ones used

Thank you very much!

换源！

1. 带开终端输入$sudo gedit /etc/apt/sources.list

2. 删除文件所有内容，复制下面的内容进去
# cn99 for dapper
deb http://ubuntu.cn99.com/ubuntu/ dapper main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ dapper-updates main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ dapper-security main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ dapper-backports main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu-cn/ dapper main restricted universe multiverse

3. 保存文件退出

4. $sudo apt-get update

5. $sudo apt-get install xxxxxxxx

I think the network does not through!

我没学过英文，
楼主的意思我没看明白，
能否用中文？