If the io.systemd.DynamicUser or io.systemd.Machine files exist, but nothing is listening on them, the nss-systemd module returns ECONNREFUSED and systemd-sysusers fails to creat the user/group. This is problematic when ran by packaging scripts, as the package assumes that after this has run, the user/group exist and can be used. adduser does not fail in the same situation. Change sysusers to print a loud warning but otherwise continue when NSS returns an error.
System and Service Manager
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