[Bug 1824276] [NEW] releaser-upgrade failure 16.04.6LTS

[Russ Herman]

Public bug reported:

Trying to get to 18.04
Stripped out all non-standard PPA references and reran update/upgrade, completed ok.
But do-release-upgrade failed with with

(appstreamcli:8886): GLib-CRITICAL **: g_strchug: assertion 'string !=
NULL' failed

(appstreamcli:8886): GLib-CRITICAL **: g_strchomp: assertion 'string !=
NULL' failed

(appstreamcli:8886): GLib-CRITICAL **: g_strchug: assertion 'string !=
NULL' failed

(appstreamcli:8886): GLib-CRITICAL **: g_strchomp: assertion 'string !=
NULL' failed

(appstreamcli:8886): GLib-CRITICAL **: g_strchug: assertion 'string !=
NULL' failed

(appstreamcli:8886): GLib-CRITICAL **: g_strchomp: assertion 'string != NULL' failed
AppStream cache update completed, but some metadata was ignored due to errors.

Checking package manager
Reading package lists... Done    
Building dependency tree          
Reading state information... Done

Calculating the changes

Calculating the changes

Could not calculate the upgrade

An unresolvable problem occurred while calculating the upgrade.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.26
ProcVersionSignature: Ubuntu 4.4.0-146.172-generic 4.4.177
Uname: Linux 4.4.0-146-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CrashDB: ubuntu
Date: Thu Apr 11 00:08:23 2019
InstallationDate: Installed on 2012-07-06 (2469 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2019-04-11 (0 days ago)
mtime.conffile..etc.update-manager.release-upgrades: 2019-04-10T22:40:31.357962

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


** Tags: amd64 apport-bug dist-upgrade xenial

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https://bugs.launchpad.net/bugs/1824276

Title:
  releaser-upgrade failure 16.04.6LTS

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

Bug description:
  Trying to get to 18.04
  Stripped out all non-standard PPA references and reran update/upgrade, completed ok.
  But do-release-upgrade failed with with

  (appstreamcli:8886): GLib-CRITICAL **: g_strchug: assertion 'string !=
  NULL' failed

  (appstreamcli:8886): GLib-CRITICAL **: g_strchomp: assertion 'string
  != NULL' failed

  (appstreamcli:8886): GLib-CRITICAL **: g_strchug: assertion 'string !=
  NULL' failed

  (appstreamcli:8886): GLib-CRITICAL **: g_strchomp: assertion 'string
  != NULL' failed

  (appstreamcli:8886): GLib-CRITICAL **: g_strchug: assertion 'string !=
  NULL' failed

  (appstreamcli:8886): GLib-CRITICAL **: g_strchomp: assertion 'string != NULL' failed
  AppStream cache update completed, but some metadata was ignored due to errors.

  Checking package manager
  Reading package lists... Done    
  Building dependency tree          
  Reading state information... Done

  Calculating the changes

  Calculating the changes

  Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.26
  ProcVersionSignature: Ubuntu 4.4.0-146.172-generic 4.4.177
  Uname: Linux 4.4.0-146-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  Date: Thu Apr 11 00:08:23 2019
  InstallationDate: Installed on 2012-07-06 (2469 days ago)
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2019-04-11 (0 days ago)
  mtime.conffile..etc.update-manager.release-upgrades: 2019-04-10T22:40:31.357962

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