标签：server-u ref targe .com https vsftp nbsp director bsp
https://www.ostechnix.com/install-vsftpd-server-ubuntu-16-04-lts/
https://www.digitalocean.com/community/tutorials/how-to-set-up-vsftpd-for-a-user-s-directory-on-ubuntu-16-04
ubuntu vsftpd
原文地址：http://www.cnblogs.com/cdsj/p/6103388.html
