Add note about hidepid mount options

    </para>

  </section>

  <section id="hidepid-unsupported">

    <!-- stretch to buster-->

    <title>Hidepid mount options for procfs unsupported</title>

    <para>

      The hidepid mount options to <filename>/proc</filename> are known to cause

      problems with current versions of systemd, and are considered by systemd

      upstream to be an unsupported configuration. Users who have modified

      <filename>/etc/fstab</filename> to enable these options are advised to

      disable them before the upgrade, to ensure login sessions work on

      &releasename;. (A possible route to re-enabling them is outlined on the

      wiki's <ulink

      url="https://wiki.debian.org/Hardening#Mounting_.2Fproc_with_hidepid">Hardening</ulink>

      page.)

    </para>

  </section>

  <section id="noteworthy-obsolete-packages" condition="fixme">

    <title>Noteworthy obsolete packages</title>

    <para>