把下面的源覆盖在/etc/apt/sources.list
deb http://http.debian.net/debian wheezy main deb-src http://http.debian.net/debian wheezy main deb http://http.debian.net/debian wheezy-updates main deb-src http://http.debian.net/debian wheezy-updates main deb http://security.debian.org/ wheezy/updates main deb-src http://security.debian.org/ wheezy/updates main