[Bug 1766727] [NEW] initramfs-tools exception during pm.DoInstall with do-release-upgrade from 16.04 to 18.04

[John George]

Public bug reported:

Upgrading from 16.04 to 18.04 using 'do-release-upgrade -d' results in:

Errors were encountered while processing:
 initramfs-tools
Exception during pm.DoInstall():  E:Sub-process /usr/bin/dpkg returned an error code (1)

Could not install the upgrades

The upgrade has aborted. Your system could be in an unusable state. A 
recovery will run now (dpkg --configure -a).

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: cdo-qa s390x

** Attachment added: "dist-upgrade_logs.tgz"
   https://bugs.launchpad.net/bugs/1766727/+attachment/5126729/+files/dist-upgrade_logs.tgz

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https://bugs.launchpad.net/bugs/1766727

Title:
  initramfs-tools exception during pm.DoInstall with  do-release-upgrade
  from 16.04 to 18.04

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  Upgrading from 16.04 to 18.04 using 'do-release-upgrade -d' results
  in:

  Errors were encountered while processing:
   initramfs-tools
  Exception during pm.DoInstall():  E:Sub-process /usr/bin/dpkg returned an error code (1)

  Could not install the upgrades

  The upgrade has aborted. Your system could be in an unusable state. A 
  recovery will run now (dpkg --configure -a).

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