[Bug 1791380] [NEW] package initramfs-tools 0.122ubuntu8.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Valiant Bear]

Public bug reported:

Very similar to other bugs, may be the same.  I added a new one due to the 0.122ubuntu8.1 vice just ubuntu8 bit.  I have no idea what any of this means, just trying to be helpful if it is a new bug...
Information I think might be important:
I was running Ubuntu Server 16.04 on a Raspberry Pi 3B+.  The pi has an SD card with BerryBoot on it, and Ubuntu Server was installed on an external USB Hard Drive.  I ran "do-release-upgrade" as recommended by the prompt after logging in, as it stated Ubuntu 18.04 was available.  The upgrade process appeared to be running smoothly until I received an error that the root device could not be found.  I was given Ctrl-C or Enter to Continue options, and I pushed enter.  The initramfs bug I am reporting came after that.  Not sure if they are related or not...

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: initramfs-tools 0.122ubuntu8.1
Uname: Linux 4.14.67v7-aufs armv7l
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: armhf
Date: Fri Sep  7 21:31:02 2018
ErrorMessage: subprocess installed post-installation script returned error exit status 1
PackageArchitecture: all
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.1
 apt  1.2.12~ubuntu16.04.1
SourcePackage: initramfs-tools
Title: package initramfs-tools 0.122ubuntu8.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to xenial on 2018-09-07 (0 days ago)

** Affects: initramfs-tools (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-package armhf third-party-packages uec-images xenial

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https://bugs.launchpad.net/bugs/1791380

Title:
  package initramfs-tools 0.122ubuntu8.1 failed to install/upgrade:
  subprocess installed post-installation script returned error exit
  status 1

Status in initramfs-tools package in Ubuntu:
  New

Bug description:
  Very similar to other bugs, may be the same.  I added a new one due to the 0.122ubuntu8.1 vice just ubuntu8 bit.  I have no idea what any of this means, just trying to be helpful if it is a new bug...
  Information I think might be important:
  I was running Ubuntu Server 16.04 on a Raspberry Pi 3B+.  The pi has an SD card with BerryBoot on it, and Ubuntu Server was installed on an external USB Hard Drive.  I ran "do-release-upgrade" as recommended by the prompt after logging in, as it stated Ubuntu 18.04 was available.  The upgrade process appeared to be running smoothly until I received an error that the root device could not be found.  I was given Ctrl-C or Enter to Continue options, and I pushed enter.  The initramfs bug I am reporting came after that.  Not sure if they are related or not...

  ProblemType: Package
  DistroRelease: Ubuntu 16.04
  Package: initramfs-tools 0.122ubuntu8.1
  Uname: Linux 4.14.67v7-aufs armv7l
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: armhf
  Date: Fri Sep  7 21:31:02 2018
  ErrorMessage: subprocess installed post-installation script returned error exit status 1
  PackageArchitecture: all
  RelatedPackageVersions:
   dpkg 1.18.4ubuntu1.1
   apt  1.2.12~ubuntu16.04.1
  SourcePackage: initramfs-tools
  Title: package initramfs-tools 0.122ubuntu8.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
  UpgradeStatus: Upgraded to xenial on 2018-09-07 (0 days ago)

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