kazulog@sv1:~$ cat /etc/os-release | head -2
PRETTY_NAME="Ubuntu 26.04 LTS"
NAME="Ubuntu"
kazulog@sv1:~$ sudo apt install -y tftpd-hpa | 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...
Installing:
  tftpd-hpa

Suggested packages:
  pxelinux

Summary:
  Upgrading: 0, Installing: 1, Removing: 0, Not Upgrading: 96
  Download size: 44.5 kB
  Space needed: 128 kB / 63.1 GB available

Get:1 http://archive.ubuntu.com/ubuntu resolute/main amd64 tftpd-hpa amd64 5.3+20251209-2 [44.5 kB]
Preconfiguring packages ...
Fetched 44.5 kB in 1s (40.5 kB/s)
Selecting previously unselected package tftpd-hpa.
(Reading database ... 91400 files and directories currently installed.)
Preparing to unpack .../tftpd-hpa_5.3+20251209-2_amd64.deb ...
Unpacking tftpd-hpa (5.3+20251209-2) ...
Setting up tftpd-hpa (5.3+20251209-2) ...
Created symlink '/etc/systemd/system/multi-user.target.wants/tftpd-hpa.service' → '/usr/lib/systemd/system/tftpd-hpa.service'.
Processing triggers for man-db (2.13.1-1build1) ...
Scanning processes...
Scanning linux images...

Running kernel seems to be up-to-date.

No services need to be restarted.

No containers need to be restarted.

No user sessions are running outdated binaries.

No VM guests are running outdated hypervisor (qemu) binaries on this host.
kazulog@sv1:~$ cat /etc/default/tftpd-hpa
# /etc/default/tftpd-hpa

TFTP_USERNAME="tftp"
TFTP_DIRECTORY="/srv/tftp"
TFTP_ADDRESS=":69"
TFTP_OPTIONS="--secure"
kazulog@sv1:~$ ls -ld /srv/tftp
drwxr-xr-x 2 root nogroup 4096 Sep 12 10:01 /srv/tftp
kazulog@sv1:~$ systemctl status tftpd-hpa --no-pager | head -7 | cat
● tftpd-hpa.service - tftpd-hpa TFTP Server
     Loaded: loaded (/usr/lib/systemd/system/tftpd-hpa.service; enabled; preset: enabled)
     Active: active (running) since Sat 2026-09-12 10:01:24 JST; 6s ago
 Invocation: 4d07df8db779481dbcc25f5fda912011
       Docs: man:in.tftpd
    Process: 2706 ExecStart=/usr/sbin/in.tftpd --listen --user $TFTP_USERNAME --address $TFTP_ADDRESS $TFTP_OPTIONS $TFTP_DIRECTORY (code=exited, status=0/SUCCESS)
   Main PID: 2707 (in.tftpd)
kazulog@sv1:~$ sudo ss -ulnp 'sport = :69'
State               Recv-Q              Send-Q                           Local Address:Port                             Peer Address:Port              Process
UNCONN              0                   0                                      0.0.0.0:69                                    0.0.0.0:*                  users:(("in.tftpd",pid=2707,fd=4))              
UNCONN              0                   0                                         [::]:69                                       [::]:*                  users:(("in.tftpd",pid=2707,fd=5))