https://blog.wongcw.com/2018/10/12/ubuntu-18-10%e5%b7%b2%e8%bf%9b%e5%85%a5final-freeze%e9%98%b6%e6%ae%b5%ef%bc%9a%e6%ad%a3%e5%bc%8f%e7%89%88%e4%b8%8b%e5%91%a8%e5%8f%91%e5%b8%83/