kazulog@sv1:~$ cat /etc/os-release | head -2
PRETTY_NAME="Ubuntu 26.04 LTS"
NAME="Ubuntu"
kazulog@sv1:~$ ls /etc/chrony/conf.d/ /etc/chrony/sources.d/
/etc/chrony/conf.d/:
README  kazulog-ntp.conf  ubuntu-nts.conf.disabled

/etc/chrony/sources.d/:
README  ubuntu-ntp-pools.sources.disabled
kazulog@sv1:~$ chronyc sources -v | tail -3
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
^* 192.168.100.1                 3   6    37     6    +11us[ -307us] +/- 6158us
kazulog@sv1:~$ chronyc sourcestats
Name/IP Address            NP  NR  Span  Frequency  Freq Skew  Offset  Std Dev
==============================================================================
192.168.100.1               5   3    71     -5.452     84.979    -64us   350us
kazulog@sv1:~$ chronyc tracking
Reference ID    : C0A86401 (192.168.100.1)
Stratum         : 4
Ref time (UTC)  : Fri Sep 11 07:28:59 2026
System time     : 0.000277020 seconds slow of NTP time
Last offset     : -0.000318293 seconds
RMS offset      : 0.000318293 seconds
Frequency       : 5.095 ppm fast
Residual freq   : -5.452 ppm
Skew            : 10.975 ppm
Root delay      : 0.005942754 seconds
Root dispersion : 0.003910748 seconds
Update interval : 65.2 seconds
Leap status     : Normal
kazulog@sv1:~$ sudo chronyc ntpdata 192.168.100.1 | head -12
Remote address  : 192.168.100.1 (C0A86401)
Remote port     : 123
Local address   : 192.168.100.10 (C0A8640A)
Leap status     : Normal
Version         : 4
Mode            : Server
Stratum         : 3
Poll interval   : 6 (64 seconds)
Precision       : -10 (0.000976562 seconds)
Root delay      : 0.000000 seconds
Root dispersion : 0.002197 seconds
Reference ID    : 7F7F0101 ()
kazulog@sv1:~$ timedatectl
               Local time: Fri 2026-09-11 16:29:22 JST
           Universal time: Fri 2026-09-11 07:29:22 UTC
                 RTC time: Fri 2026-09-11 07:29:22
                Time zone: Asia/Tokyo (JST, +0900)
System clock synchronized: yes
              NTP service: active
          RTC in local TZ: no