cd /etc/apt/
sudo wget http://mirrors.163.com/.help/sources.list.hardy #Ubuntu 8.04
sudo wget http://mirrors.163.com/.help/sources.list.lucid #Ubuntu 10.04
sudo wget http://mirrors.163.com/.help/sources.list.maverick #Ubuntu 10.10
sudo wget http://mirrors.163.com/.help/sources.list.natty #Ubuntu 11.04
sudo wget http://mirrors.163.com/.help/sources.list.oneiric #Ubuntu 11.10
sudo wget http://mirrors.163.com/.help/sources.list.precise #Ubuntu 12.04
#备份
sudo mv sources.list sources.list.bak
#xxxxx为对应的版本
sudo mv sources.list.xxxxx sources.list