kazulog@sv1:~$ cat /etc/os-release | head -2
PRETTY_NAME="Ubuntu 26.04 LTS"
NAME="Ubuntu"
kazulog@sv1:~$ grep -vE '^(#|$)' /etc/vsftpd.conf
listen=NO
listen_ipv6=YES
anonymous_enable=NO
local_enable=YES
write_enable=YES
local_umask=022
dirmessage_enable=YES
use_localtime=YES
xferlog_enable=YES
connect_from_port_20=YES
secure_chroot_dir=/var/run/vsftpd/empty
pam_service_name=vsftpd
rsa_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
rsa_private_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
ssl_enable=YES
chroot_local_user=YES
user_sub_token=$USER
local_root=/srv/ftp-users/$USER
kazulog@sv1:~$ sudo ls -laR /srv/ftp-users/
/srv/ftp-users/:
total 12
drwxr-xr-x 3 root root 4096 Sep 12 10:22 .
drwxr-xr-x 4 root root 4096 Sep 12 10:22 ..
drwxr-xr-x 3 root root 4096 Sep 12 10:22 ftpdemo

/srv/ftp-users/ftpdemo:
total 16
drwxr-xr-x 3 root    root    4096 Sep 12 10:22 .
drwxr-xr-x 3 root    root    4096 Sep 12 10:22 ..
-rw-r--r-- 1 root    root      26 Sep 12 10:22 hello.txt
drwxr-xr-x 2 ftpdemo ftpdemo 4096 Sep 12 10:24 upload

/srv/ftp-users/ftpdemo/upload:
total 16
drwxr-xr-x 2 ftpdemo ftpdemo 4096 Sep 12 10:24 .
drwxr-xr-x 3 root    root    4096 Sep 12 10:22 ..
-rw-r--r-- 1 ftpdemo ftpdemo   18 Sep 12 10:24 curl.txt
-rw-r--r-- 1 ftpdemo ftpdemo   18 Sep 12 10:23 upload.txt
kazulog@sv1:~$ systemctl is-enabled vsftpd; systemctl is-active vsftpd
enabled
active
kazulog@sv1:~$ sudo ss -tlnp 'sport = :21'
State               Recv-Q              Send-Q                             Local Address:Port                             Peer Address:Port              Process
LISTEN              0                   32                                             *:21                                          *:*                  users:(("vsftpd",pid=5460,fd=3))