su
cd /etc/apt
wget http://mirrors.163.com/.help/sources.list.lucid
mv sources.list sources.list.backup
mv sources.list.lucid sources.list
apt-get update
apt-get dist-upgrade
Track: http://hi.baidu.com/quickreport/item/d8eca6e134ba5eb52e140b53
PS：http://mirrors.aliyun.com/