Public bug reported:
While trying to track down a behavior difference between focal and
impish, I installed focal's kernel in an impish userspace and attempted
to boot it. The boot failed, unable to find root. While GRUB reported
that it had loaded the initramfs, no initramfs messages were emitted
during boot. I tracked this down to initramfs-tools having switched to
use zstd compression by default. zstd decompression does not appear to
be supported by the LTS 5.4 kernel - it appears to have been added
upstream in v5.9. I imagine this is likely to cause problems with
partial-upgrade scenarios.
** Affects: initramfs-tools (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1941649
Title:
switch to zstd by default breaks booting focal LTS kernel
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