Debian 10 - Server Install

> apt install proftpd -y

Configurações

> vim /etc/proftpd/proftpd.conf

ServerName                      "Servidor"
ServerType                      standalone
DeferWelcome                    off

Add User

> adduser webmaster

Change home folder

> vim /etc/passwd

ex.: 
webmaster:x:1000:33::/home/webmaster/:/bin/sh
webmaster:x:1000:33::/var/www/html/site/:/bin/sh

Group: www-data

> gpasswd -a webmaster www-data

Obs.: Retirar o shell do ususario e testar.
Ex.: webmaster:x:1000:33::/var/www/html/site/:/bin/false