[Bug 1783372] Re: upgrade from 16.04 to 18.04 not possible

[Ubuntu Foundations Team Bug Bot]

** Tags added: xenial2bionic

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https://bugs.launchpad.net/bugs/1783372

Title:
  upgrade from 16.04 to 18.04 not possible

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

Bug description:
  appstreamcli:3751): GLib-CRITICAL **: g_strchug: assertion 'string !=
  NULL' failed

  (appstreamcli:3751): GLib-CRITICAL **: g_strchomp: assertion 'string
  != NULL' failed

  (appstreamcli:3751): GLib-CRITICAL **: g_strchug: assertion 'string !=
  NULL' failed

  (appstreamcli:3751): GLib-CRITICAL **: g_strchomp: assertion 'string
  != NULL' failed

  (appstreamcli:3751): GLib-CRITICAL **: g_strchug: assertion 'string !=
  NULL' failed

  (appstreamcli:3751): 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

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.25
  ProcVersionSignature: Ubuntu 4.15.0-29.31~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-29-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Tue Jul 24 19:09:00 2018
  InstallationDate: Installed on 2018-06-18 (35 days ago)
  InstallationMedia: Ubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-07-24 (0 days ago)

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