Been seeing this since new install of Linux Mint 20 (2 weeks ago)
(Have not noticed on a LM19.3 upgrade on a different machine)

I have been finding several small bugs and wondered if this may have
something to do with any of them.

I just tried the above fix.

I no longer see the error on boot up, but according to dmesg, my boot
time has increased by approximately 0.85 seconds.

No clue, yet, whether any other processes have been affected.

System:    Kernel: 5.4.0-42-generic x86_64 bits: 64 compiler: gcc v: 9.3.0 
Desktop: MATE 1.24.0 
           wm: marco dm: LightDM Distro: Linux Mint 20 Ulyana base: Ubuntu 
20.04 focal

You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to initramfs-tools in Ubuntu.

  initramfs unpacking failed

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

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

  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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