Ubuntu 12.10 更新源

root@ubuntu:~# cp /etc/apt/sources.list /etc/apt/sources.list_bak
root@ubuntu:~# vi /etc/apt/sources.list
root@ubuntu:~# cat /etc/apt/sources.list
deb ftp://mirrors.xmu.edu.cn/ubuntu/archive quantal main restricted universe multiverse
deb ftp://mirrors.xmu.edu.cn/ubuntu/archive quantal-backports main restricted universe multiverse
deb ftp://mirrors.xmu.edu.cn/ubuntu/archive quantal-proposed main restricted universe multiverse
deb ftp://mirrors.xmu.edu.cn/ubuntu/archive quantal-security main restricted universe multiverse
deb ftp://mirrors.xmu.edu.cn/ubuntu/archive quantal-updates main restricted universe multiverse 
deb-src ftp://mirrors.xmu.edu.cn/ubuntu/archive quantal main restricted universe multiverse
deb-src ftp://mirrors.xmu.edu.cn/ubuntu/archive quantal-backports main restricted universe multiverse
deb-src ftp://mirrors.xmu.edu.cn/ubuntu/archive quantal-proposed main restricted universe multiverse
deb-src ftp://mirrors.xmu.edu.cn/ubuntu/archive quantal-security main restricted universe multiverse
deb-src ftp://mirrors.xmu.edu.cn/ubuntu/archive quantal-updates main restricted universe multiverse
root@ubuntu:~# 

root@ubuntu:~# sudo apt-get update&&sudo apt-get upgrade