current ubuntu kernel compression method is breaking VMs using pygrub (Xen)

Oliver Linden oliver_linden at
Sun Jan 23 15:19:41 UTC 2022

With at least the two most recent kernel versions


ubuntu switched to ZSTD as default kernel compression method breaking 
all Xen installations using "pygrub", regardless whether it's a Dom0 or 
a DomU.

Please switch back to a "pygrub" supported kernel compression method.

Best, Oliver
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