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<p>With at least the two most recent kernel versions</p>
<p><span style="font-family:monospace"><span
style="color:#000000;background-color:#ffffff;">linux-image-5.13.0-25-generic<br>
</span></span><span style="font-family:monospace"><span
style="color:#000000;background-color:#ffffff;">linux-image-5.13.0-27-generic</span><br>
</span></p>
<p>ubuntu switched to ZSTD as default kernel compression method
breaking all Xen installations using "pygrub", regardless whether
it's a Dom0 or a DomU.</p>
<p>Please switch back to a "pygrub" supported kernel compression
method.</p>
<p>Best, Oliver<br>
<span style="font-family:monospace"><span
style="color:#000000;background-color:#ffffff;"></span></span></p>
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