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yangwei@gavin:~$ sudo apt-get update


Err http://ftp.sjtu.edu.cn dapper Release.gpg
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper/main Translation-en_US
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper/multiverse Translation-en_US
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper/restricted Translation-en_US
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper/universe Translation-en_US
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-backports Release.gpg
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-backports/main Translation-en_US
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-backports/multiverse Translation-en_US
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-backports/restricted Translation-en_US
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-backports/universe Translation-en_US
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-proposed Release.gpg
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-proposed/main Translation-en_US
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-proposed/multiverse Translation-en_US
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-proposed/restricted Translation-en_US
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-proposed/universe Translation-en_US
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-security Release.gpg
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-security/main Translation-en_US
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-security/multiverse Translation-en_US
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-security/restricted Translation-en_US
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-security/universe Translation-en_US
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-updates Release.gpg
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-updates/main Translation-en_US
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-updates/multiverse Translation-en_US
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-updates/restricted Translation-en_US
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-updates/universe Translation-en_US
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper Release.gpg
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper/bleeding Translation-en_US
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper/main Translation-en_US
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper/multiverse Translation-en_US
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper/restricted Translation-en_US
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper/universe Translation-en_US
Could not resolve 'f'
Ign http://ftp.sjtu.edu.cn dapper Release
Ign http://ftp.sjtu.edu.cn dapper-backports Release
Ign http://ftp.sjtu.edu.cn dapper-proposed Release
Ign http://ftp.sjtu.edu.cn dapper-security Release
Ign http://ftp.sjtu.edu.cn dapper-updates Release
Ign http://ftp.sjtu.edu.cn dapper Release
Ign http://ftp.sjtu.edu.cn dapper/main Packages
Ign http://ftp.sjtu.edu.cn dapper/multiverse Packages
Ign http://ftp.sjtu.edu.cn dapper/restricted Packages
Ign http://ftp.sjtu.edu.cn dapper/universe Packages
Ign http://ftp.sjtu.edu.cn dapper-backports/main Packages
Ign http://ftp.sjtu.edu.cn dapper-backports/multiverse Packages
Ign http://ftp.sjtu.edu.cn dapper-backports/restricted Packages
Ign http://ftp.sjtu.edu.cn dapper-backports/universe Packages
Ign http://ftp.sjtu.edu.cn dapper-proposed/main Packages
Ign http://ftp.sjtu.edu.cn dapper-proposed/multiverse Packages
Ign http://ftp.sjtu.edu.cn dapper-proposed/restricted Packages
Ign http://ftp.sjtu.edu.cn dapper-proposed/universe Packages
Ign http://ftp.sjtu.edu.cn dapper-security/main Packages
Ign http://ftp.sjtu.edu.cn dapper-security/multiverse Packages
Ign http://ftp.sjtu.edu.cn dapper-security/restricted Packages
Ign http://ftp.sjtu.edu.cn dapper-security/universe Packages
Ign http://ftp.sjtu.edu.cn dapper-updates/main Packages
Ign http://ftp.sjtu.edu.cn dapper-updates/multiverse Packages
Ign http://ftp.sjtu.edu.cn dapper-updates/restricted Packages
Ign http://ftp.sjtu.edu.cn dapper-updates/universe Packages
Ign http://ftp.sjtu.edu.cn dapper/bleeding Packages
Ign http://ftp.sjtu.edu.cn dapper/main Packages
Ign http://ftp.sjtu.edu.cn dapper/multiverse Packages
Ign http://ftp.sjtu.edu.cn dapper/restricted Packages
Ign http://ftp.sjtu.edu.cn dapper/universe Packages
Err http://ftp.sjtu.edu.cn dapper/main Packages
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper/multiverse Packages
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper/restricted Packages
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper/universe Packages
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-backports/main Packages
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-backports/multiverse Packages
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-backports/restricted Packages
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-backports/universe Packages
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-proposed/main Packages
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-proposed/multiverse Packages
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-proposed/restricted Packages
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-proposed/universe Packages
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-security/main Packages
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-security/multiverse Packages
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-security/restricted Packages
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-security/universe Packages
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-updates/main Packages
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-updates/multiverse Packages
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-updates/restricted Packages
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper-updates/universe Packages
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper/bleeding Packages
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper/main Packages
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper/multiverse Packages
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper/restricted Packages
Could not resolve 'f'
Err http://ftp.sjtu.edu.cn dapper/universe Packages
Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dapper/Release.gpg Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... -en_US.bz2 Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... -en_US.bz2 Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... -en_US.bz2 Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... -en_US.bz2 Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... elease.gpg Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... -en_US.bz2 Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... -en_US.bz2 Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... -en_US.bz2 Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... -en_US.bz2 Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... elease.gpg Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... -en_US.bz2 Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... -en_US.bz2 Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... -en_US.bz2 Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... -en_US.bz2 Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... elease.gpg Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... -en_US.bz2 Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... -en_US.bz2 Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... -en_US.bz2 Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... -en_US.bz2 Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... elease.gpg Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... -en_US.bz2 Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... -en_US.bz2 Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... -en_US.bz2 Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... -en_US.bz2 Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu-cn/dists/ ... elease.gpg Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu-cn/dists/ ... -en_US.bz2 Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu-cn/dists/ ... -en_US.bz2 Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu-cn/dists/ ... -en_US.bz2 Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu-cn/dists/ ... -en_US.bz2 Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu-cn/dists/ ... -en_US.bz2 Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... ackages.gz Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... ackages.gz Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... ackages.gz Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... ackages.gz Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... ackages.gz Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... ackages.gz Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... ackages.gz Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... ackages.gz Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... ackages.gz Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... ackages.gz Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... ackages.gz Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... ackages.gz Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... ackages.gz Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... ackages.gz Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... ackages.gz Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... ackages.gz Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... ackages.gz Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... ackages.gz Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... ackages.gz Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu/dists/dap ... ackages.gz Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu-cn/dists/ ... ackages.gz Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu-cn/dists/ ... ackages.gz Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu-cn/dists/ ... ackages.gz Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu-cn/dists/ ... ackages.gz Could not resolve 'f'
Failed to fetch http://ftp.sjtu.edu.cn/ubuntu-cn/dists/ ... ackages.gz Could not resolve 'f'
Reading package lists... Done
E: Some index files failed to download, they have been ignored, or old ones used instead.

可能是源的问题吧。
参照这里。
http://wiki.ubuntu.org.cn/%E5%BF%AB%E9% ... 7%E5%8D%97
自己选择对应的版本。就有详细的说明。