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<refsect1>

<para id="singular">This option is only available for system services, or for services running in per-user
 instances of the service manager in which case <varname>PrivateUsers=</varname> is implicitly enabled
 (requires unprivileged user namespaces support to be enabled in the kernel via the
 <literal>kernel.unprivileged_userns_clone=</literal> sysctl).</para>

<para id="plural">These options are only available for system services, or for services running in per-user
 instances of the service manager in which case <varname>PrivateUsers=</varname> is implicitly enabled
 (requires unprivileged user namespaces support to be enabled in the kernel via the
 <literal>kernel.unprivileged_userns_clone=</literal> sysctl).</para>

</refsect1>
