kazulog@sv1:~$ cat /etc/os-release | head -2
PRETTY_NAME="Ubuntu 26.04 LTS"
NAME="Ubuntu"
kazulog@sv1:~$ sudo ls -l /home/ftpdemo/
total 12
-rw-r--r-- 1 ftpdemo ftpdemo 26 Sep 12 10:16 hello.txt
-rw------- 1 ftpdemo ftpdemo 18 Sep 12 10:20 upload.txt
-rw-r--r-- 1 ftpdemo ftpdemo 18 Sep 12 10:21 upload2.txt
kazulog@sv1:~$ tail -5 /etc/vsftpd.conf
#utf8_filesystem=YES
# 利用者を自分のディレクトリに閉じ込める
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 10:22 upload

/srv/ftp-users/ftpdemo/upload:
total 8
drwxr-xr-x 2 ftpdemo ftpdemo 4096 Sep 12 10:22 .
drwxr-xr-x 3 root    root    4096 Sep 12 10:22 ..
kazulog@sv1:~$ sudo systemctl restart vsftpd