This issue started for me sometime around the middle of July this year. When initially run I'm presented with this error:
AppStream system cache was updated, but problems were found: Metadata files have errors: /var/cache/app-info/xmls/fwupd.xml
Reading package lists... Done
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
Running again within a few minutes and the error is gone.
This is:
Distributor ID: Ubuntu
Description: Ubuntu 16.04.5 LTS
Release: 16.04
Codename: xenial
uname -a
Linux localhost 4.15.0-30-generic #32~16.04.1-Ubuntu SMP Thu Jul 26 20:25:39 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
Output of - apt-cache policy appstream libappstream3
appstream:
Installed: 0.10.6-1~ubuntu16.04.2
Candidate: 0.10.6-1~ubuntu16.04.2
Version table:
*** 0.10.6-1~ubuntu16.04.2 100
100 http://us.archive.ubuntu.com/ubuntu xenial-backports/main amd64 Packages
100 /var/lib/dpkg/status
0.9.4-1ubuntu4 500
500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
0.9.4-1 500
500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
libappstream3:
Installed: 0.9.4-1ubuntu4
Candidate: 0.9.4-1ubuntu4
Version table:
*** 0.9.4-1ubuntu4 500
500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
100 /var/lib/dpkg/status
0.9.4-1 500
500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
Running 'sudo appstream refresh --refresh --force gives:
chris@localhost:~$ sudo appstreamcli refresh --force --verbose
[sudo] password for chris:
** (appstreamcli:31561): DEBUG: Added /usr/share/app-info/xmls to metadata search path.
** (appstreamcli:31561): DEBUG: Added /var/lib/app-info/yaml to metadata search path.
** (appstreamcli:31561): DEBUG: Added /var/cache/app-info/xmls to metadata search path.
** (appstreamcli:31561): DEBUG: Refreshing AppStream cache
** (appstreamcli:31561): DEBUG: Searching for data in: /usr/share/app-info/xmls
** (appstreamcli:31561): DEBUG: Searching for data in: /var/cache/app-info/xmls
** (appstreamcli:31561): DEBUG: Searching for data in: /var/lib/app-info/yaml
** (appstreamcli:31561): DEBUG: Reading: /usr/share/app-info/xmls/org.freedesktop.fwupd.xml
** (appstreamcli:31561): DEBUG: Reading: /var/cache/app-info/xmls/fwupd.xml
** (appstreamcli:31561): DEBUG: WARNING: Could not parse XML data: Entity: line 265: parser error : attributes construct error
<checksum filename="Firmware_SF30&SN30_Pro_V1.26.dat"target="content
^
Entity: line 265: parser error : Couldn't find end of Start Tag checksum line 265
<checksum filename="Firmware_SF30&SN30_Pro_V1.26.dat"target="content
^
Entity: line 265: parser error : Opening and ending tag mismatch: release line 262 and checksum
"target="content" type="sha1">3ef2bdee8aca2a45b9f53b4d4cce9722523f57f8</checksum
^
Entity: line 269: parser error : Opening and ending tag mismatch: releases line 261 and release
</release>
^
Entity: line 270: parser error : Opening and ending tag mismatch: component line 247 and releases
</releases>
^
Entity: line 278: parser error : Opening and ending tag mismatch: components line 2 and component
</component>
^
Entity: line 279: parser error : Extra content at the end of the document
<component type="firmware">
^
** (appstreamcli:31561): DEBUG: Reading: /var/lib/app-info/yaml/us.archive.ubuntu.com_ubuntu_dists_xenial-updates_multiverse_dep11_Components-amd64.yml.gz
** (appstreamcli:31561): DEBUG: Reading: /var/lib/app-info/yaml/us.archive.ubuntu.com_ubuntu_dists_xenial_main_dep11_Components-amd64.yml.gz
** (appstreamcli:31561): DEBUG: Reading: /var/lib/app-info/yaml/us.archive.ubuntu.com_ubuntu_dists_xenial_multiverse_dep11_Components-amd64.yml.gz
** (appstreamcli:31561): DEBUG: Reading: /var/lib/app-info/yaml/security.ubuntu.com_ubuntu_dists_xenial-security_main_dep11_Components-amd64.yml.gz
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: Reading: /var/lib/app-info/yaml/security.ubuntu.com_ubuntu_dists_xenial-security_restricted_dep11_Components-amd64.yml.gz
** (appstreamcli:31561): DEBUG: Reading: /var/lib/app-info/yaml/us.archive.ubuntu.com_ubuntu_dists_xenial_restricted_dep11_Components-amd64.yml.gz
** (appstreamcli:31561): DEBUG: Reading: /var/lib/app-info/yaml/us.archive.ubuntu.com_ubuntu_dists_xenial_universe_dep11_Components-amd64.yml.gz
** (appstreamcli:31561): DEBUG: Reading: /var/lib/app-info/yaml/security.ubuntu.com_ubuntu_dists_xenial-security_universe_dep11_Components-amd64.yml.gz
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: Reading: /var/lib/app-info/yaml/security.ubuntu.com_ubuntu_dists_xenial-security_multiverse_dep11_Components-amd64.yml.gz
** (appstreamcli:31561): DEBUG: Reading: /var/lib/app-info/yaml/us.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_dep11_Components-amd64.yml.gz
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: Reading: /var/lib/app-info/yaml/us.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_dep11_Components-amd64.yml.gz
** (appstreamcli:31561): DEBUG: Reading: /var/lib/app-info/yaml/us.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_dep11_Components-amd64.yml.gz
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: Reading: /var/lib/app-info/yaml/us.archive.ubuntu.com_ubuntu_dists_xenial-backports_main_dep11_Components-amd64.yml.gz
** (appstreamcli:31561): DEBUG: Reading: /var/lib/app-info/yaml/us.archive.ubuntu.com_ubuntu_dists_xenial-backports_restricted_dep11_Components-amd64.yml.gz
** (appstreamcli:31561): DEBUG: Reading: /var/lib/app-info/yaml/us.archive.ubuntu.com_ubuntu_dists_xenial-backports_multiverse_dep11_Components-amd64.yml.gz
** (appstreamcli:31561): DEBUG: Reading: /var/lib/app-info/yaml/us.archive.ubuntu.com_ubuntu_dists_xenial-backports_universe_dep11_Components-amd64.yml.gz
** (appstreamcli:31561): DEBUG: YAML: Unknown field 'root/Launchable' found.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/virtualbox.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/mythtv.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/mythtv-setup.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/nm-connection-editor.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/libreoffice-base.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/libreoffice-draw.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/eog.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/libreoffice-math.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/org.gnome.FileRoller.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/shotwell.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/libreoffice-impress.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/emacs24.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/emacs24-term.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/transmission-gtk.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/transmission-qt.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/gvim.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/update-manager.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/vim.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/libreoffice-startcenter.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/evince.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/display-im6.q16.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/libreoffice-calc.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/libreoffice-writer.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/display-im6.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/plan.desktop was already added with the same priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/flcheckers.desktop was already added with the same priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/flblocks.desktop was already added with the same priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/flsudoku.desktop was already added with the same priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/org.kde.kmail.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/atril.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/calibre-gui.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/pcmanfm-desktop-pref.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/pcmanfm.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/epiphany.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/gimp.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/vlc.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/lxterminal.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/kodi.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/org.kde.akregator.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/org.kde.korganizer.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/wpa_gui.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/firewall-config.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/org.kde.kleopatra.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/chromium-browser.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/org.kde.kalarm.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/tracker-preferences.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/tracker-needle.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/org.kde.ark.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/ettercap.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/org.kde.blogilo.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/emacs24-lucid.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/libreoffice-base.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/nm-connection-editor.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/org.gnome.Nautilus.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/gstreamer1.0-plugins-good was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/libreoffice-draw.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/eog.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/libreoffice-math.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/gnome-system-monitor.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/gnome-system-monitor-kde.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/org.gnome.Calendar.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/emacs24.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/emacs24-term.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/transmission-qt.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/vino-preferences.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/gnome-session-properties.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/software-properties-drivers.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/software-properties-gtk.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/software-properties-gnome.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/libreoffice-startcenter.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/evince.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/display-im6.q16.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/display-im6.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/org.gnome.DiskUtility.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/deja-dup.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/org.gnome.font-viewer.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/gnome-sudoku.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/unity-appearance-panel.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/unity-mouse-panel.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/unity-bluetooth-panel.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/unity-sound-panel.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/unity-datetime-panel.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/unity-network-panel.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/unity-wacom-panel.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/unity-region-panel.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/unity-user-accounts-panel.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/unity-keyboard-panel.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/unity-color-panel.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/unity-universal-access-panel.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/xdiagnose.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/upstart-monitor.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/fcitx-configtool.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/fcitx.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/ubiquity.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/language-selector.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/gnome-calculator.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/org.gnome.FileRoller.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/unity-activity-log-manager-panel.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/activity-log-manager.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/shotwell.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/openjdk-8-policytool.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/ibus-setup.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/libreoffice-impress.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/im-config.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/gvim.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/webbrowser-app.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/transmission-gtk.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/update-manager.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/vim.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/libreoffice-calc.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/libreoffice-writer.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/org.kde.kmail.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/org.kde.importwizard was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/atril.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/pcmanfm-desktop-pref.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/pcmanfm.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/evolution-ews' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/org.gnome.taquin.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/org.kde.klipper was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/caja-browser.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/caja-file-management-properties.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/wpa_gui.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/org.kde.PartitionManager.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/xpdf.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/mate-session-properties.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/gufw.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/org.gnome.Weather.Application.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/muse.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/brasero.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/wireshark-gtk.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/virt-manager.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/org.kde.kleopatra.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/org.kde.ark.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/chromium-browser.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/org.kde.korganizer.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/tracker-preferences.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/tracker-needle.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/org.kde.akregator.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/mscore.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/abiword.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/org.kde.blogilo.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/boinc-manager.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/evolution.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/calibre-gui.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/pidgin.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/gstreamer1.0-plugins-bad was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/Thunar-bulk-rename.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/Thunar.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/thunar-settings.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/owncloud.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/comix.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/ubuntu-mate-welcome.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/ubuntu-mate-software.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/vlc.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/epiphany.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/org.gnome.Documents.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/org.gnome.Books.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/lxterminal.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/wireshark.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/kodi.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/org.kde.akonadiconsole was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/evolution-spamassassin' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/evolution-bogofilter' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/org.gnome.Contacts.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/light-locker-settings.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/CMake.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/firewall-config.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/ubiquity-kdeui.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/gimp.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/lshw-gtk.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/bat.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/org.kde.kalarm.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/emacs24-lucid.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/mplayer.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/simple-image-reducer.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/org.gnome.Maps.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/yubioath.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/ccsm.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/nut-monitor.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Metadata ignored: Detected colliding ids: system/os/package/ettercap.desktop was already added with a higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/lubuntu-nexus7-identica.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: Replaced 'system/os/package/htop.desktop' with data of higher priority.
** (appstreamcli:31561): DEBUG: system/os/package/zathura-pdf-poppler.desktop extends system/os/package/zathura.desktop, but system/os/package/zathura.desktop was not found.
** (appstreamcli:31561): DEBUG: Error while updating the in-memory data pool: Metadata files have errors: /var/cache/app-info/xmls/fwupd.xml
** (appstreamcli:31561): DEBUG: Stemming language is: en
AppStream system cache was updated, but problems were found: Metadata files have errors: /var/cache/app-info/xmls/fwupd.xml
chris@localhost:~$
Having done a lot of searching with Google on this issue I found that there is a problem in line 265 of the file /var/cache/app-info/xmls/fwupd.xml. The fix appears to be to change this portion of the line from this - Firmware_SF30&SN30_Pro_V1.26.dat to this - Firmware_SF30&SN30_Pro_V1.26.dat I have done that as shown below by pasting lines 250->280
<summary>Firmware for the 8Bitdo SF30/SN30 Pro Game Controller</summary>
<developer_name>8Bitdo</developer_name>
<description><p>Updating the firmware on your SF30/SN30 Pro device improves performance and adds new features.</p></description>
<project_license>Proprietary</project_license>
<url type="homepage">http://www.8bitdo.com/sn30pro-sf30pro/</url>
<screenshots>
<screenshot type="default">
<caption>Unplug the controller, hold down L1 + R1 + START until the red LED on top of the controller is flashing and then reconnect the controller.</caption>
<image type="source">https://raw.githubusercontent.com/hughsie/8bitdo-firmware/master/screenshots/sn30-pro.svg</image>
</screenshot>
</screenshots>
<releases>
<release version="1.26" urgency="medium" timestamp="1526688000">
<location>https://fwupd.org/downloads/3d3a65ee2e8581647fb09d752fa7e21ee1566481-8Bitdo-SF30_Pro-SN30_Pro-1.26.cab</location>
<checksum filename="3d3a65ee2e8581647fb09d752fa7e21ee1566481-8Bitdo-SF30_Pro-SN30_Pro-1.26.cab" target="container" type="sha1">c33b8487ae9eb332061245a3986e29669f8e82b3</checksum>
<checksum filename="Firmware_SF30&SN30_Pro_V1.26.dat"target="content" type="sha1">3ef2bdee8aca2a45b9f53b4d4cce9722523f57f8</checksum>
<description><p>This stable release fixes the following issues:</p><ul><li>Enhance the accuracy of vibration and analog in SWITCH mode</li></ul></description>
<size type="installed">81436</size>
<size type="download">83857</size>
</release>
</releases>
<provides>
<firmware type="flashed">269b3121-097b-50d8-b9ba-d1f64f9cd241</firmware>
<firmware type="flashed">50afc861-c345-56d2-b4be-8a54e6a1ed12</firmware>
<firmware type="flashed">81becceb-f87b-5c66-b30a-b0958043d65d</firmware>
<firmware type="flashed">b3850dd5-a010-5d5c-8834-2ff809e95869</firmware>
<firmware type="flashed">e5f6e0cf-c156-58e6-94e5-10ef2dff807c</firmware>
</provides>
</component>
<component type="firmware">
<id>com.8bitdo.sfc30.firmware</id>
Line 265 - <checksum filename="Firmware_SF30&SN30_Pro_V1.26.dat"target="content as it is now.
This will probably be marked as a duplicate of question https://answers.launchpad.net/ubuntu/+question/670595