Thank you, 2001:67c:1560:8003::c8 availability has been fixed.
$ ntpdate -q 2001:67c:1560:8003::c8
server 2001:67c:1560:8003::c8, stratum 2, offset 0.031201, delay 0.18932
24 Apr 13:10:37 ntpdate[26740]: adjust time server 2001:67c:1560:8003::c8
offset 0.031201 sec
** Changed in: systemd (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1766106
Title:
ntp.ubuntu.com not reliable, but used in standard configuration
Status in systemd package in Ubuntu:
Fix Released
Bug description:
In systemd-timesyncd ntp.ubuntu.com is used as fall back ntp server.
However, one of the addresses it resolves to is not available for
quite some while:
[...]
Apr 14 07:37:42 singold systemd-timesyncd[773]: Timed out waiting for reply
from [2001:67c:1560:8003::c8]:123 (ntp.ubuntu.com).
Apr 14 08:10:45 singold systemd-timesyncd[773]: Timed out waiting for reply
from [2001:67c:1560:8003::c8]:123 (ntp.ubuntu.com).
Apr 15 08:20:48 singold systemd-timesyncd[802]: Timed out waiting for reply
from [2001:67c:1560:8003::c8]:123 (ntp.ubuntu.com).
Apr 15 12:47:56 singold systemd-timesyncd[842]: Timed out waiting for reply
from [2001:67c:1560:8003::c8]:123 (ntp.ubuntu.com).
Apr 16 07:39:05 singold systemd-timesyncd[842]: Timed out waiting for reply
from [2001:67c:1560:8003::c8]:123 (ntp.ubuntu.com).
Apr 18 18:11:05 singold systemd-timesyncd[842]: Timed out waiting for reply
from [2001:67c:1560:8003::c8]:123 (ntp.ubuntu.com).
Apr 19 23:45:04 singold systemd-timesyncd[758]: Timed out waiting for reply
from [2001:67c:1560:8003::c8]:123 (ntp.ubuntu.com).
Apr 20 14:20:46 singold systemd-timesyncd[758]: Timed out waiting for reply
from [2001:67c:1560:8003::c8]:123 (ntp.ubuntu.com).
Apr 21 09:42:45 singold systemd-timesyncd[758]: Timed out waiting for reply
from [2001:67c:1560:8003::c8]:123 (ntp.ubuntu.com).
Apr 22 09:41:52 singold systemd-timesyncd[672]: Timed out waiting for reply
from [2001:67c:1560:8003::c8]:123 (ntp.ubuntu.com).
Apr 22 09:47:03 singold systemd-timesyncd[672]: Timed out waiting for reply
from [2001:67c:1560:8003::c8]:123 (ntp.ubuntu.com).
[...]
It turns out that from all the A and AAAA records ntp.ubuntu.com
resolves the, 2001:67c:1560:8003::c8 seems to be constantly down.
This leads to time synchronisation problems for people using IPv6, as
it seems timesyncd keeps returning to the same server over and over
again, instead of trying the other ones DNS returns.
A practical solution to this would be to simply remove
2001:67c:1560:8003::c8 from the DNS entry for ntp.ubuntu.com.
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