apt install vsftpd
cp /etc/vsftpd.conf /etc/vsftpd.conf.backup
nano /etc/vsftpd.conf
редактируем строки
local_enable=YES
write_enable=YES
chroot_local_user=YES
allow_writeable_chroot=YES
systemctl restart vsftpd
adduser ftpuser --home /srv/ftp
chown -R ftpuser /srv/ftp