花了几个小时，把13.04更新完了
结束后发现 Chrome 的 Flash Player Plugin不能用，折腾了半天才搞定
原来是国内源的问题，只好换到主服务器源就OK了，顺便贴一下13.04的主源
>>> sudo gedit /etc/apt/source.lst
deb http://archive.ubuntu.com/ubuntu/ raring main restricted universe multiverse deb http://archive.ubuntu.com/ubuntu/ raring-security main restricted universe multiverse deb http://archive.ubuntu.com/ubuntu/ raring-updates main restricted universe multiverse deb http://archive.ubuntu.com/ubuntu/ raring-proposed main restricted universe multiverse deb http://archive.ubuntu.com/ubuntu/ raring-backports main restricted universe multiverse deb-src http://archive.ubuntu.com/ubuntu/ raring main restricted universe multiverse deb-src http://archive.ubuntu.com/ubuntu/ raring-security main restricted universe multiverse deb-src http://archive.ubuntu.com/ubuntu/ raring-updates main restricted universe multiverse deb-src http://archive.ubuntu.com/ubuntu/ raring-proposed main restricted universe multiverse deb-src http://archive.ubuntu.com/ubuntu/ raring-backports main restricted universe multiverse