[Bug 1824276] Re: releaser-upgrade failure 16.04.6LTS

[Ubuntu Foundations Team Bug Bot]

*** This bug is a duplicate of bug 1069133 ***
    https://bugs.launchpad.net/bugs/1069133

Reviewing the files from your upgrade attempt you seem to have enabled a
PPA that provides Xorg packages. This will prevent the upgrade as that
PPA contains different versions of packages essential to Ubuntu. The
page, https://launchpad.net/~xorg-edgers/+archive/ppa, contains details
on to how to revert to the official Xorg packages for the xorg-edgers
PPA.  Instructions for reverting to official Xorg packages should be
similar for the PPA that you have enabled. Thanks.

[This is an automated message.  I apologize if it reached you
inappropriately; please just reply to this message indicating so.]

** Tags added: xenial2bionic

** Tags added: ppa

** Tags added: xorg-edgers-ppa

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Invalid

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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:
  Invalid

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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