[Bug 1937125] [NEW] Attempting to upgrade from 16.04 to 18.04

[Seth]

Public bug reported:

ubuntu-release-updater fails with the following:

(appstreamcli:11029): GLib-CRITICAL **: g_strchug: assertion 'string !=
NULL' failed

(appstreamcli:11029): GLib-CRITICAL **: g_strchomp: assertion 'string !=
NULL' failed

(appstreamcli:11029): GLib-CRITICAL **: g_strchug: assertion 'string !=
NULL' failed

(appstreamcli:11029): 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.

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'

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.32 [origin: unknown]
ProcVersionSignature: Ubuntu 4.15.0-30.32~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-30-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: XFCE
Date: Wed Jul 21 12:04:18 2021
InstallationDate: Installed on 2018-01-22 (1276 days ago)
InstallationMedia: BackBox Linux 5 - Release amd64
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2021-07-21 (0 days ago)
mtime.conffile..etc.update-manager.release-upgrades: 2021-07-21T11:55:59.974270

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


** Tags: amd64 apport-bug dist-upgrade third-party-packages xenial

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https://bugs.launchpad.net/bugs/1937125

Title:
  Attempting to upgrade from 16.04 to 18.04

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

Bug description:
  ubuntu-release-updater fails with the following:

  (appstreamcli:11029): GLib-CRITICAL **: g_strchug: assertion 'string
  != NULL' failed

  (appstreamcli:11029): GLib-CRITICAL **: g_strchomp: assertion 'string
  != NULL' failed

  (appstreamcli:11029): GLib-CRITICAL **: g_strchug: assertion 'string
  != NULL' failed

  (appstreamcli:11029): 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.

  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'

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.32 [origin: unknown]
  ProcVersionSignature: Ubuntu 4.15.0-30.32~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-30-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: XFCE
  Date: Wed Jul 21 12:04:18 2021
  InstallationDate: Installed on 2018-01-22 (1276 days ago)
  InstallationMedia: BackBox Linux 5 - Release amd64
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2021-07-21 (0 days ago)
  mtime.conffile..etc.update-manager.release-upgrades: 2021-07-21T11:55:59.974270

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