入/etc/apt バックアップsources.list cp sources.list sources.list.bak
ソースファイルの内容を削除する.
echo '' > source.list
163のソースをdebに投げ込むhttp://mirrors.163.com/ubuntu/precise main restricted universe multiverse deb http://mirrors.163.com/ubuntu/precise-security main restricted universe multiverse deb http://mirrors.163.com/ubuntu/precise-updates main restricted universe multiverse deb http://mirrors.163.com/ubuntu/precise-proposed main restricted universe multiverse deb http://mirrors.163.com/ubuntu/precise-backports main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/precise main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/precise-security main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/precise-updates main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/precise-proposed main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/precise-backports main restricted universe multiverse を更新
apt-get update