Jan,
As noted in the linked bug report, there are some logs which are uniquely stored in the systemd journal, the journal is not persistent-by-default, and data loss is occurring as a default behavior.
On Fri, Nov 17, 2017 at 11:21 AM Jan Claeys <lists@janc.be> wrote:
On Mon, 2017-11-13 at 16:12 +0000, Mark Stosberg wrote:
> *"For a standard Ubuntu Maverick (10.10) system, the output will be
> sent to file /var/log/daemon.log, whilst on newer Ubuntu systems
> such as Ubuntu Natty (11.04), the output will be directed to file
> /var/log/syslog."*
>
> In turn, I understand that "syslog" logging has been persistent-by-
> default per years.
>
> It seems that with the switch to systemd as the init system, the
> logging that originates from the init system became not-persistent by
> default.
$ grep -c 'systemd\[1\]:' /var/log/syslog
39
It's still there...
--
Jan Claeys