Comment 4 for bug 2054716

So the call of:

  systemd-tmpfiles --create || :

in systemd.postinst is an Ubuntu delta from Debian, which was originally introduced in to fix bug 1748147. If a package just lets debhelper generate its systemd-tmpfiles and systemd-sysusers calls (dh_installtmpfiles and dh_installsysusers), then each package's postinst will call systemd-tmpfiles and systemd-sysusers such that *only* configurations shipped by the package are processed.

From a quick investigation, it seems that we might not need the fix for bug 1748147 any longer (calling systemd-tmpfiles --create var.conf after systemd-tmpfiles --create 00rsyslog.conf does not undo the syslog changes). Hence, dropping this call from systemd.postinst might be the right fix.