Here is what I got on running `sudo appstreamcli refresh --force --verbose` and `appstreamcli status` on the terminal...still the apps are not appearing on Unbuntu Software. Please help!! sumit@sumit-Dell-System-XPS-L502X:~$ sudo appstreamcli refresh --force --verbose[sudo] password for sumit: ** (appstreamcli:25608): DEBUG: Refreshing AppStream cache ** (appstreamcli:25608): DEBUG: Reading: /usr/share/app-info/xmls/org.freedesktop.fwupd.xml ** (appstreamcli:25608): DEBUG: Reading: /var/lib/app-info/yaml/in.archive.ubuntu.com_ubuntu_dists_xenial_main_dep11_Components-amd64.yml.gz ** (appstreamcli:25608): DEBUG: Reading: /var/lib/app-info/yaml/security.ubuntu.com_ubuntu_dists_xenial-security_universe_dep11_Components-amd64.yml.gz ** (appstreamcli:25608): DEBUG: Reading: /var/lib/app-info/yaml/security.ubuntu.com_ubuntu_dists_xenial-security_multiverse_dep11_Components-amd64.yml.gz ** (appstreamcli:25608): DEBUG: Reading: /var/lib/app-info/yaml/in.archive.ubuntu.com_ubuntu_dists_xenial_restricted_dep11_Components-amd64.yml.gz ** (appstreamcli:25608): DEBUG: Reading: /var/lib/app-info/yaml/security.ubuntu.com_ubuntu_dists_xenial-security_main_dep11_Components-amd64.yml.gz ** (appstreamcli:25608): DEBUG: DEP11: Unknown key 'root/Launchable' found. ** (appstreamcli:25608): DEBUG: Reading: /var/lib/app-info/yaml/security.ubuntu.com_ubuntu_dists_xenial-security_restricted_dep11_Components-amd64.yml.gz ** (appstreamcli:25608): DEBUG: Reading: /var/lib/app-info/yaml/in.archive.ubuntu.com_ubuntu_dists_xenial_universe_dep11_Components-amd64.yml.gz ** (appstreamcli:25608): DEBUG: Reading: /var/lib/app-info/yaml/in.archive.ubuntu.com_ubuntu_dists_xenial_multiverse_dep11_Components-amd64.yml.gz ** (appstreamcli:25608): DEBUG: Reading: /var/lib/app-info/yaml/in.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_dep11_Components-amd64.yml.gz ** (appstreamcli:25608): DEBUG: DEP11: Unknown key 'root/Launchable' found. ** (appstreamcli:25608): DEBUG: Reading: /var/lib/app-info/yaml/in.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_dep11_Components-amd64.yml.gz ** (appstreamcli:25608): DEBUG: Reading: /var/lib/app-info/yaml/in.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_dep11_Components-amd64.yml.gz ** (appstreamcli:25608): DEBUG: Reading: /var/lib/app-info/yaml/in.archive.ubuntu.com_ubuntu_dists_xenial-updates_multiverse_dep11_Components-amd64.yml.gz ** (appstreamcli:25608): DEBUG: Reading: /var/lib/app-info/yaml/in.archive.ubuntu.com_ubuntu_dists_xenial-backports_main_dep11_Components-amd64.yml.gz ** (appstreamcli:25608): DEBUG: Reading: /var/lib/app-info/yaml/in.archive.ubuntu.com_ubuntu_dists_xenial-backports_restricted_dep11_Components-amd64.yml.gz ** (appstreamcli:25608): DEBUG: Reading: /var/lib/app-info/yaml/in.archive.ubuntu.com_ubuntu_dists_xenial-backports_universe_dep11_Components-amd64.yml.gz ** (appstreamcli:25608): DEBUG: DEP11: Unknown key 'root/Launchable' found. ** (appstreamcli:25608): DEBUG: Reading: /var/lib/app-info/yaml/in.archive.ubuntu.com_ubuntu_dists_xenial-backports_multiverse_dep11_Components-amd64.yml.gz ** (appstreamcli:25608): DEBUG: Reading: /var/cache/app-info/xmls/fwupd.xml ** (appstreamcli:25608): DEBUG: Replaced 'libreoffice-writer.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'libreoffice-math.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'org.gnome.FileRoller.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'vim.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'eog.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'evince.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'libreoffice-startcenter.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'display-im6.q16.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'gvim.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'libreoffice-base.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'nm-connection-editor.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'libreoffice-impress.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'display-im6.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'libreoffice-draw.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'libreoffice-calc.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: org.kde.ark.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: vlc.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: kodi.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: gimp.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: epiphany.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: chromium-browser.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: tracker-preferences.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: tracker-needle.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: ettercap.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: plan.desktop was already added with the same priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: flcheckers.desktop was already added with the same priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: flblocks.desktop was already added with the same priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: flsudoku.desktop was already added with the same priority. ** (appstreamcli:25608): DEBUG: Replaced 'update-manager.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: eog.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: evince.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'gnome-system-monitor.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'gnome-system-monitor-kde.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: org.gnome.FileRoller.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'gnome-session-properties.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'upstart-monitor.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: libreoffice-startcenter.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'fcitx.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'fcitx-configtool.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'deja-dup.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: nm-connection-editor.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: libreoffice-writer.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'webbrowser-app.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'gnome-sudoku.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'vino-preferences.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'unity-activity-log-manager-panel.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'activity-log-manager.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'xdiagnose.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: display-im6.q16.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'software-properties-gtk.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'software-properties-drivers.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'software-properties-gnome.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: vim.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: gvim.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: libreoffice-math.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'unity-bluetooth-panel.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'unity-universal-access-panel.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'unity-appearance-panel.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'unity-wacom-panel.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'unity-keyboard-panel.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'unity-color-panel.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'unity-network-panel.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'unity-mouse-panel.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'unity-sound-panel.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'unity-user-accounts-panel.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'unity-datetime-panel.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'unity-region-panel.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'gnome-calculator.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: gstreamer1.0-plugins-good was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'ubiquity.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'org.gnome.Calendar.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'language-selector.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'im-config.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'org.gnome.font-viewer.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: display-im6.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: libreoffice-base.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'org.gnome.Nautilus.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: libreoffice-impress.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: libreoffice-calc.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: libreoffice-draw.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'bat.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'ubiquity-kdeui.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'ubuntu-mate-software.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'ubuntu-mate-welcome.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'abiword.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'org.gnome.Contacts.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'evolution-ews' with data of higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: chromium-browser.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'org.gnome.Documents.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'org.gnome.Books.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'gufw.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'brasero.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'mscore.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'org.gnome.Weather.Application.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: wireshark.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'comix.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'simple-image-reducer.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: tracker-preferences.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: tracker-needle.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'org.gnome.taquin.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: org.kde.ark.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'owncloud.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'htop.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'muse.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: kodi.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'evolution-spamassassin' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'evolution-bogofilter' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'virt-manager.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: pidgin.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: epiphany.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'org.gnome.Maps.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: vlc.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: wireshark-gtk.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'Thunar-bulk-rename.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'Thunar.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'thunar-settings.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'CMake.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'ccsm.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: ettercap.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'evolution.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: gimp.desktop was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'mplayer.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'boinc-manager.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Detected colliding ids: gstreamer1.0-plugins-bad was already added with a higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'light-locker-settings.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'lshw-gtk.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'mythtv.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'virtualbox.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: Replaced 'mythtv-setup.desktop' with data of higher priority. ** (appstreamcli:25608): DEBUG: zathura-pdf-poppler.desktop extends zathura.desktop, but zathura.desktop was not found. ** (appstreamcli:25608): DEBUG: Removing old rebuild-dir from previous database rebuild. AppStream cache update completed successfully. sumit@sumit-Dell-System-XPS-L502X:~$ appstreamcli status AppStream Status: Version: 0.9.4 Distribution metadata: /usr/share/app-info - XML: 1 - No icons. /var/lib/app-info - YAML: 16 - Iconsets: ubuntu-xenial-security-main ubuntu-xenial-security-universe ubuntu-xenial-security-multiverse ubuntu-xenial-main ubuntu-xenial-universe ubuntu-xenial-multiverse ubuntu-xenial-updates-main ubuntu-xenial-updates-universe ubuntu-xenial-updates-multiverse ubuntu-xenial-backports-main ubuntu-xenial-backports-universe ubuntu-xenial-backports-multiverse /var/cache/app-info - XML: 1 - No icons. Upstream metadata: - Found 38 components in legacy paths. Summary: The system metadata cache exists. We have information on 1887 software components.