[Bug 1875407] Re: package initramfs-tools 0.136ubuntu6 failed to install/upgrade: installed initramfs-tools package post-installation script subprocess returned error exit status 1

[edward prest]

while installing kicad v6 on brand new 20.04 install on ssd

using

sudo add-apt-repository --yes ppa:kicad/kicad-6.0-releases
sudo apt update
sudo apt install --install-recommends kicad
# If you want demo projects
sudo apt install kicad-demos

fails with


Processing triggers for desktop-file-utils (0.24-1ubuntu3) ...
Processing triggers for initramfs-tools (0.136ubuntu6.6) ...
update-initramfs: Generating /boot/initrd.img-5.13.0-28-generic
E: /usr/share/initramfs-tools/hooks/iscan failed with return 1.
update-initramfs: failed for /boot/initrd.img-5.13.0-28-generic with 1.
dpkg: error processing package initramfs-tools (--configure):
 installed initramfs-tools package post-installation script subprocess returned error exit status 1
Errors were encountered while processing:
 initramfs-tools
E: Sub-process /usr/bin/dpkg returned an error code (1)

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

Status in initramfs-tools package in Ubuntu:
  Confirmed

Bug description:
  Received this error when doing do-release-upgrade from ubuntu 18.04.4
  to 20.4

  ProblemType: Package
  DistroRelease: Ubuntu 20.04
  Package: initramfs-tools 0.136ubuntu6
  ProcVersionSignature: Ubuntu 4.15.0-96.97-generic 4.15.18
  Uname: Linux 4.15.0-96-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Mon Apr 27 09:59:42 2020
  ErrorMessage: installed initramfs-tools package post-installation script subprocess returned error exit status 1
  InstallationDate: Installed on 2016-01-12 (1567 days ago)
  InstallationMedia: Ubuntu-Server 15.10 "Wily Werewolf" - Release amd64 (20151021)
  PackageArchitecture: all
  Python3Details: /usr/bin/python3.8, Python 3.8.2, python3-minimal, 3.8.2-0ubuntu2
  PythonDetails: /usr/bin/python2.7, Python 2.7.18rc1, python-is-python2, 2.7.17-4
  RelatedPackageVersions:
   dpkg 1.19.7ubuntu3
   apt  2.0.2
  SourcePackage: initramfs-tools
  Title: package initramfs-tools 0.136ubuntu6 failed to install/upgrade: installed initramfs-tools package post-installation script subprocess returned error exit status 1
  UpgradeStatus: Upgraded to focal on 2020-04-27 (0 days ago)

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