kazulog@sv1:~$ cat /etc/os-release | head -2
PRETTY_NAME="Ubuntu 26.04 LTS"
NAME="Ubuntu"
kazulog@sv1:~$ sudo apt purge -y vsftpd | cat
WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

Reading package lists...
Building dependency tree...
Reading state information...
Solving dependencies...
The following package was automatically installed and is no longer required:
  ssl-cert
Use 'sudo apt autoremove' to remove it.

REMOVING:
  vsftpd*

Summary:
  Upgrading: 0, Installing: 0, Removing: 1, Not Upgrading: 96
  Freed space: 316 kB

(Reading database ... 91464 files and directories currently installed.)
Removing vsftpd (3.0.5-0.4) ...
Processing triggers for man-db (2.13.1-1build1) ...
(Reading database ... 91413 files and directories currently installed.)
Purging configuration files for vsftpd (3.0.5-0.4) ...
kazulog@sv1:~$ dpkg -l vsftpd 2>&1 | tail -1
dpkg-query: no packages found matching vsftpd
kazulog@sv1:~$ ls -l /etc/vsftpd.conf 2>&1
ls: cannot access '/etc/vsftpd.conf': No such file or directory
kazulog@sv1:~$ sudo ls -ld /srv/ftp /srv/ftp-users/ftpdemo/upload 2>&1
ls: cannot access '/srv/ftp': No such file or directory
drwxr-xr-x 2 ftpdemo ftpdemo 4096 Sep 12 10:30 /srv/ftp-users/ftpdemo/upload
kazulog@sv1:~$ getent passwd ftp
ftp:x:103:110:ftp daemon:/srv/ftp:/usr/sbin/nologin
kazulog@sv1:~$ sudo ss -tlnp 'sport = :21'; echo "ss rc=$?"
State                  Recv-Q                  Send-Q                                   Local Address:Port                                   Peer Address:Port                 Process
ss rc=0