[Bug 1835660] Re: initramfs unpacking failed

[Edmand Thipursian]

Hi, I had this same issue while updating ubuntu 20, however, I have
noticed that kernal hung error while the update stalled.

So I have added the following in  /etc/sysctl.conf and rebooted the
server, this issue has gone(we can apply those parameter without
restarting server usings sysctl -w vm.dirty_background_ratio=5.

vm.dirty_background_ratio=5
vm.dirty_ratio=10

vm.swappiness=30
vm.vfs_cache_pressure=50

I have tried 4 different vms and it works with the workaround. Kernal is used as follows; 
5.4.0-26-generic #30-Ubuntu SMP Mon Apr 20 16:58:30 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

I am sure the could help some people out there to resolve this issue
asap.

Thanks
Edmand

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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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