Public bug reported:

While trying to upgrade from 18.04 to the development version 18.10
using "update-manager -d" the upgrade aborts before "getting new
packages". A windows pops up with the following information:

Error during upgrade
A problem occurred during the update. This is usually some sort of network 
problem, please check your network connection and retry.

E:Problem executing scripts APT::Update::Post-Invoke-Success 'if
/usr/bin/test -w /var/cache/app-info -a -e /usr/bin/appstreamcli; then
appstreamcli refresh-cache > /dev/null; fi', E:Sub-process returned an
error code

This is what is shown in the terminal:

(update-manager:24678): dbind-WARNING **: 16:51:39.742: Couldn't register with 
accessibility bus: Did not receive a reply. Possible causes include: the remote 
application did not send a reply, the message bus security policy blocked the 
reply, the reply timeout expired, or the network connection was broken.
Checking for a new Ubuntu release
Checking for a new Ubuntu release
/usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeFetcher.py:23: 
PyGIWarning: Gtk was imported without specifying a version first. Use 
gi.require_version('Gtk', '3.0') before import to ensure that the right version 
gets loaded.
  from gi.repository import Gtk, Gdk
/usr/lib/python3/dist-packages/DistUpgrade/ReleaseNotesViewerWebkit.py:33: 
PyGIWarning: WebKit2 was imported without specifying a version first. Use 
gi.require_version('WebKit2', '4.0') before import to ensure that the right 
version gets loaded.
  from gi.repository import WebKit2 as WebKit
Gtk-Message: 16:52:03.247: GtkDialog mapped without a transient parent. This is 
discouraged.
authenticate 'cosmic.tar.gz' against 'cosmic.tar.gz.gpg' 
extracting 'cosmic.tar.gz'

(appstreamcli:11327): GLib-CRITICAL **: 16:52:52.522:
g_variant_builder_end: assertion '!GVSB(builder)->uniform_item_types ||
GVSB(builder)->prev_item_type != NULL || g_variant_type_is_definite
(GVSB(builder)->type)' failed

(appstreamcli:11327): GLib-CRITICAL **: 16:52:52.522:
g_variant_new_variant: assertion 'value != NULL' failed

(appstreamcli:11327): GLib-ERROR **: 16:52:52.522: g_variant_new_parsed: 
11-13:invalid GVariant format string
Trace/breakpoint trap (core dumped)

(appstreamcli:12912): GLib-CRITICAL **: 16:52:55.923:
g_variant_builder_end: assertion '!GVSB(builder)->uniform_item_types ||
GVSB(builder)->prev_item_type != NULL || g_variant_type_is_definite
(GVSB(builder)->type)' failed

(appstreamcli:12912): GLib-CRITICAL **: 16:52:55.923:
g_variant_new_variant: assertion 'value != NULL' failed

(appstreamcli:12912): GLib-ERROR **: 16:52:55.923: g_variant_new_parsed: 
11-13:invalid GVariant format string
Trace/breakpoint trap (core dumped)

(appstreamcli:14235): GLib-CRITICAL **: 16:52:59.435:
g_variant_builder_end: assertion '!GVSB(builder)->uniform_item_types ||
GVSB(builder)->prev_item_type != NULL || g_variant_type_is_definite
(GVSB(builder)->type)' failed

(appstreamcli:14235): GLib-CRITICAL **: 16:52:59.436:
g_variant_new_variant: assertion 'value != NULL' failed

(appstreamcli:14235): GLib-ERROR **: 16:52:59.436: g_variant_new_parsed: 
11-13:invalid GVariant format string
Trace/breakpoint trap (core dumped)

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.25
ProcVersionSignature: Ubuntu 4.15.0-34.37-generic 4.15.18
Uname: Linux 4.15.0-34-generic x86_64
NonfreeKernelModules: usbd
ApportVersion: 2.20.9-0ubuntu7.3
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity:Unity7:ubuntu
Date: Tue Sep 18 16:45:57 2018
InstallationDate: Installed on 2015-10-17 (1066 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2018-09-18 (0 days ago)
VarLogDistupgradeAptlog:
 Log time: 2018-09-18 16:43:51.853711
 Log time: 2018-09-18 16:43:56.390218
 Log time: 2018-09-18 16:44:55.357839
VarLogDistupgradeTermlog:
 
mtime.conffile..etc.update-manager.release-upgrades: 2018-09-18T16:04:37.053307

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


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

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https://bugs.launchpad.net/bugs/1793164

Title:
  appstreamcli error when upgrading from 18.04 to 18.10

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