https://blog.wongcw.com/2018/12/18/nethserver-7-6-%e7%99%bc%e5%b8%83%e9%9d%a2%e5%90%91%e6%9c%8d%e5%8b%99%e5%99%a8%e7%9a%84linux-%e7%99%bc%e8%a1%8c%e7%89%88/