翻译自:https://www.digitalocean.com/community/tutorials/how-to-add-and-delete-users-on-ubuntu-16-04
加入用户: sudo adduser <newuser>
查看用户组: groups <newuser>
加入sudo组: sudo usermod -aG sudo <newuser>
删除用户: sudo deluser <newuser>
, sudo deluser --remove-home <newuser>