[Bug 1766727] Missing required logs.

[Ubuntu Kernel Bot]

This bug is missing log files that will aid in diagnosing the problem.
While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:

apport-collect 1766727

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

** Tags added: bionic

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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 initramfs-tools package in Ubuntu:
  New
Status in linux package in Ubuntu:
  Incomplete
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).

  ---

  Processing triggers for systemd (237-3ubuntu10) ...
  Processing triggers for initramfs-tools (0.130ubuntu3) ...
  update-initramfs: Generating /boot/initrd.img-4.4.0-121-generic
  Using config file '/etc/zipl.conf'
  Error: Ramdisk file '/boot/initrd.img' in section 'ubuntu': No such file or directory
  run-parts: /etc/initramfs/post-update.d//zz-zipl exited with return code 1
  dpkg: error processing package initramfs-tools (--configure):
   installed initramfs-tools package post-installation script subprocess returned error exit status 1
  Processing triggers for ca-certificates (20180409) ...
  Updating certificates in /etc/ssl/certs...
  0 added, 0 removed; done.
  Running hooks in /etc/ca-certificates/update.d...
  done.
  Processing triggers for dictionaries-common (1.27.2) ...
  Processing triggers for linux-image-4.15.0-19-generic (4.15.0-19.20) ...
  /etc/kernel/postinst.d/initramfs-tools:
  update-initramfs: Generating /boot/initrd.img-4.15.0-19-generic
  Using config file '/etc/zipl.conf'
  Building bootmap in '/boot'
  Building menu 'menu'
  Adding #1: IPL section 'ubuntu' (default)
  Adding #2: IPL section 'old'
  Preparing boot device: dasdb (0104).
  Done.
  /etc/kernel/postinst.d/zz-zipl:
  Using config file '/etc/zipl.conf'
  Building bootmap in '/boot'
  Building menu 'menu'
  Adding #1: IPL section 'ubuntu' (default)
  Adding #2: IPL section 'old'
  Preparing boot device: dasdb (0104).
  Done.
  Processing triggers for sgml-base (1.29) ...
  Processing triggers for resolvconf (1.79ubuntu10) ...
  Processing triggers for ureadahead (0.100.0-20) ...
  Errors were encountered while processing:
   initramfs-tools
  Log ended: 2018-04-24  13:12:40

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