how to install ftp server in ubuntu 20.04
sudo apt install vsftpd
sudo echo write_enable=YES >> /etc/vsftpd.conf
sudo systemctl restart vsftpd
# if running a UFW firewall do:
sudo ufw allow 20:21/tcp
sudo ufw allow 30000:31000/tcp
sudo ufw allow OpenSSH
sudo ufw disable && sudo ufw enable