修改etc/apt/sources.list文件
deb http://mirrors.163.com/ubuntu/ lucid main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ lucid-security main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ lucid-updates main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ lucid-proposed main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ lucid-backports main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ lucid main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ lucid-security main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ lucid-updates main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ lucid-proposed main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ lucid-backports main restricted universe multiverse
deb http://mirrors.sohu.com/ubuntu/ lucid main restricted universe multiverse
deb http://mirrors.sohu.com/ubuntu/ lucid-security main restricted universe multiverse
deb http://mirrors.sohu.com/ubuntu/ lucid-updates main restricted universe multiverse
deb http://mirrors.sohu.com/ubuntu/ lucid-proposed main restricted universe multiverse
deb http://mirrors.sohu.com/ubuntu/ lucid-backports main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ lucid main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ lucid-security main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ lucid-updates main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ lucid-proposed main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ lucid-backports main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ natty main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ natty-security main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ natty-updates main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ natty-proposed main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ natty-backports main restricted universe multiverse
deb-src http://old-releases.ubuntu.com/ubuntu/ natty main restricted universe multiverse
deb-src http://old-releases.ubuntu.com/ubuntu/ natty-security main restricted universe multiverse
deb-src http://old-releases.ubuntu.com/ubuntu/ natty-updates main restricted universe multiverse
deb-src http://old-releases.ubuntu.com/ubuntu/ natty-proposed main restricted universe multiverse
deb-src http://old-releases.ubuntu.com/ubuntu/ natty-backports main restricted universe multiverse