I believe I experienced the same, with root cause a lack of free space
in /boot. After the upgrade failed with errors, but _before_ attempting
a reboot, my workaround was:

apt autoremove
mkdir /boot_moved_20201011
mv initrd.img-4.15.0-118-generic /boot_moved_20201011/
apt-get upgrade
mv /boot_moved_20201011/initrd.img-4.15.0-118-generic .

#reboot

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to initramfs-tools in Ubuntu.
https://bugs.launchpad.net/bugs/1897747

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:
  Confirmed

Bug description:
  do-rleasae-upgrade from 18.04 to 20.04 today.
  upgrade from 16.04 to 18.04 performed last Sunday on 5 machines.

  ProblemType: Package
  DistroRelease: Ubuntu 20.04
  Package: initramfs-tools 0.136ubuntu6.3
  ProcVersionSignature: Ubuntu 4.15.0-118.119-generic 4.15.18
  Uname: Linux 4.15.0-118-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.9
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Tue Sep 29 11:56:41 2020
  ErrorMessage: installed initramfs-tools package post-installation script 
subprocess returned error exit status 1
  InstallationDate: Installed on 2013-11-28 (2496 days ago)
  InstallationMedia: Ubuntu-Server 12.04.3 LTS "Precise Pangolin" - Release 
amd64 (20130820.2)
  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  2.0.2ubuntu0.1
  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 2020-09-29 (0 days ago)

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