[Bug 1899907] Re: package initramfs-tools 0.136ubuntu6.3 failed to install/upgrade: installed initramfs-tools package post-installation script subprocess returned error exit status 1

[Bmatthewshea]

I resolved this 18->20 upgrade issue by making room in `/boot`.

> uname -a

(get current kernel running) I removed a 4.4 kernel that isn't used.

Example
> sudo apt purge linux-image-4.4.0-000-generic

then run:
> sudo dpkg --configure -a
(`sudo update-grub` should also take care of it)

PS -
if you see:
"WARNING: PV /dev/sda5 in VG YOUR-vg is using an old PV header, modify the VG to update."
You also need to do:
> sudo vgck --updatemetadata YOUR-vg
should also fix those warnings post-20 upgrade.

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Title:
  package initramfs-tools 0.136ubuntu6.3 failed to install/upgrade:
  installed initramfs-tools package post-installation script subprocess
  returned error exit status 1

Status in initramfs-tools package in Ubuntu:
  New

Bug description:
  Processing triggers for initramfs-tools (0.136ubuntu6.3) ...
  update-initramfs: Generating /boot/initrd.img-5.4.0-51-generic
  Error 24 : Write error : cannot write compressed block
  E: mkinitramfs failure cpio 141 lz4 -9 -l 24
  update-initramfs: failed for /boot/initrd.img-5.4.0-51-generic with 1.
  dpkg: error processing package initramfs-tools (--configure):
   installed initramfs-tools package post-installation script subprocess returned error exit status 1

  ProblemType: Package
  DistroRelease: Ubuntu 20.04
  Package: initramfs-tools 0.136ubuntu6.3
  ProcVersionSignature: Ubuntu 4.15.0-121.123-generic 4.15.18
  Uname: Linux 4.15.0-121-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.9
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Thu Oct 15 10:18:16 2020
  ErrorMessage: installed initramfs-tools package post-installation script subprocess returned error exit status 1
  InstallationDate: Installed on 2016-04-15 (1643 days ago)
  InstallationMedia: Ubuntu-Server 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  PackageArchitecture: all
  Python3Details: /usr/bin/python3.8, Python 3.8.5, python3-minimal, 3.8.2-0ubuntu2
  PythonDetails: /usr/bin/python2.7, Python 2.7.18, python-is-python2, 2.7.17-4
  RelatedPackageVersions:
   dpkg 1.19.7ubuntu3
   apt  2.0.2ubuntu0.1
  SourcePackage: initramfs-tools
  Title: package initramfs-tools 0.136ubuntu6.3 failed to install/upgrade: installed initramfs-tools package post-installation script subprocess returned error exit status 1
  UpgradeStatus: Upgraded to focal on 2020-10-15 (0 days ago)

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