[Bug 1877690] Re: I am trying to update my old ubuntu to the latest version

[Ubuntu Foundations Team Bug Bot]

** Tags added: xenial2bionic

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https://bugs.launchpad.net/bugs/1877690

Title:
  I am trying to update my old ubuntu to the latest version

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

Bug description:
  
  (appstreamcli:5810): GLib-CRITICAL **: g_strchug: assertion 'string != NULL' failed

  (appstreamcli:5810): GLib-CRITICAL **: g_strchomp: assertion 'string
  != NULL' failed

  (appstreamcli:5810): GLib-CRITICAL **: g_strchug: assertion 'string !=
  NULL' failed

  (appstreamcli:5810): GLib-CRITICAL **: g_strchomp: assertion 'string
  != NULL' failed

  (appstreamcli:5810): GLib-CRITICAL **: g_strchug: assertion 'string !=
  NULL' failed

  (appstreamcli:5810): 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.

  This was likely caused by: 
  * Unofficial software packages not provided by Ubuntu 
  Please use the tool 'ppa-purge' from the ppa-purge 
  package to remove software from a Launchpad PPA and 
  try the upgrade again. 

  If none of this applies, then please report this bug using the 
  command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.If 
  you want to investigate this yourself the log files in 
  '/var/log/dist-upgrade' will contain details about the upgrade. 
  Specifically, look at 'main.log' and 'apt.log'. 

  
  Restoring original system state

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.30
  ProcVersionSignature: Ubuntu 4.4.0-179.209-generic 4.4.219
  Uname: Linux 4.4.0-179-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.23
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Sat May  9 02:13:55 2020
  InstallationDate: Installed on 2016-06-01 (1437 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2020-05-09 (0 days ago)
  mtime.conffile..etc.update-manager.release-upgrades: 2020-05-09T01:46:38.093536

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