[Bug 1835660] Re: initramfs unpacking failed

[TJ]

Is part of the issue here that some (most) initramfs-tools created
images have an uncompressed early CPU microcode firmware prefixed ?

That is stored as ASCII CPIO which is why Con see's that reported by
'file' since that tool checks the magic signatures at start of a file.

binwalk reveals more detail.

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https://bugs.launchpad.net/bugs/1835660

Title:
  initramfs unpacking failed

Status in initramfs-tools package in Ubuntu:
  Invalid
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  "initramfs unpacking failed: Decoding failed",  message appears on
  boot up.

  If I "update-initramfs" using gzip instead of lz, then boot up passes
  without decoding failed message.

  ---

  However, we currently believe that the decoding error reported in
  dmesg is actually harmless and has no impact on usability on the
  system.

  Switching from lz4 to gzip compression, simply papers over the
  warning, without any benefits, and slows down boot.

  Kernel should be fixed to correctly parse lz4 compressed initrds, or
  at least lower the warning, to not be user visible as an error.

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