$ sudo apt update && sudo apt install vsftpd
$ sudo service vsftpd status
$ sudo ufw allow 21/tcp
$ sudo mv /etc/vsftpd.conf /etc/vsftpd.conf_orig
$ sudo nano /etc/vsftpd.conf
listen=NO
listen_ipv6=YES
anonymous_enable=NO
local_enable=YES
write_enable=YES
local_umask=022
dirmessage_enable=YES
use_localtime=YES
xferlog_enable=YES
connect_from_port_20=YES
chroot_local_user=YES
secure_chroot_dir=/var/run/vsftpd/empty
pam_service_name=vsftpd
rsa_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
rsa_private_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
ssl_enable=NO
pasv_enable=Yes
pasv_min_port=10000
pasv_max_port=10100
allow_writeable_chroot=YES
$ sudo ufw allow from any to any port 20,21,10000:10100 proto tcp
sudo systemctl stop vsftpd.service
sudo systemctl start vsftpd.service
sudo systemctl enable vsftpd.service
$ sudo systemctl restart vsftpd
$ sudo useradd -m ftpuser
$ sudo passwd ftpuser
$ sudo bash -c "echo FTP TESTING > /home/ftpuser/FTP-TEST"
$ ftp 127.0.0.1