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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">Hello</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">I’m trying to raise awareness on issue 1717040:</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"><a href="https://bugs.launchpad.net/xenial-backports/+bug/1717040">https://bugs.launchpad.net/xenial-backports/+bug/1717040</a></span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"><br>
zstd is a compression algorithm developed at Facebook.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">It’s available on most linux/bsd distributions, as referenced here:</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"><a href="https://repology.org/metapackage/zstd/versions">https://repology.org/metapackage/zstd/versions</a></span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">Unfortunately, Ubuntu LTS 16.04 Xenial shipped with an experimental version, labelled v0.5.1.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">This version uses an early experimental format, incompatible with the “stable” format,
</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">officially supported since all versions starting >= v1.0 (unofficially supported starting >= v0.8.x).</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">This makes Ubuntu Xenial incompatible with all other distributions, including later Ubuntu releases,</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">because it reads and generate a different format.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">This has ripple effects on a growing number of applications depending on zstd, as they cannot rely on system’s libzstd,
</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">since an especially important Linux distribution ships an incompatible version.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">Ubuntu Xenial is latest Ubuntu LTS version, and it’s expected to stay around and be supported up to 2021.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">To solve this problem, it’s enough to backport a new version of libzstd, from a newer Ubuntu release.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">To this end, a backport request has been issued:</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"><a href="https://bugs.launchpad.net/xenial-backports/+bug/1717040">https://bugs.launchpad.net/xenial-backports/+bug/1717040</a></span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">the package proposed here has been tested, and works successfully.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"><br>
Unfortunately, the process seems to be stuck in the “after test” stage, with no progress since September.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">Is there any way to get this action completed, so that applications depending on zstd can safely expect it to work on Ubuntu LTS too?</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">Regards</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">Yann Collet</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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