Public bug reported:
systemd has broken this by the split of timesyncd.
On a system that installed chrony (or other NTP servers) you'll have:
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-=================-==============-============-===============================================================
ii chrony 3.5-6ubuntu3 amd64 Versatile implementation of
the Network Time Protocol
rc systemd-timesyncd 245.4-4ubuntu1 amd64 minimalistic service to
synchronize local time with NTP servers
That left this behind:
/etc/dhcp/dhclient-exit-hooks.d/timesyncd
And if you now run a dhcp based time server push it will fail very
badly.
P.S. This is triggered by the chrony autopkgtests but not an issue in chrony
yet it is in systemd.
But due to that one can use [1] as easy reproducer, I wonder how systemd
slipped by this issue in autopkgtest?
It contains:
systemctl try-restart systemd-timesyncd.service || true
Which in the setup the system now has will trigger:
sudo dhclient dummy0
Failed to try-restart systemd-timesyncd.service: Unit systemd-timesyncd.service
is masked.
P.S. I'll harden the chrony test to not stumble over this but it should
be revisited for systemd to provide a better fix than causing this
message every time (maybe pre-check if it is enabled and unmasked)?
[1]: https://git.launchpad.net/ubuntu/+source/chrony/tree/debian/tests
/time-sources-from-dhcp-servers?h=ubuntu/focal-devel
** Affects: chrony (Ubuntu)
Importance: Undecided
Status: New
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
** Also affects: chrony (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1873031
Title:
245.4-2ubuntu1 has broken dhcp based NTP updates
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