Comment 0 for bug 1575248

I have found that when there are new packages available which my machine doesn't know about yet, if I run "sudo apt-get update" this is the output:

    Get:1 http://gb.archive.ubuntu.com/ubuntu xenial InRelease [247 kB]
    Hit:2 http://security.ubuntu.com/ubuntu xenial-security InRelease
    Get:3 http://gb.archive.ubuntu.com/ubuntu xenial-updates InRelease [82.2 kB]
    Get:4 http://security.ubuntu.com/ubuntu xenial-security/main i386 Packages [28 B]
    Get:5 http://gb.archive.ubuntu.com/ubuntu xenial-backports InRelease [82.2 kB]
    Get:6 http://security.ubuntu.com/ubuntu xenial-security/restricted i386 Packages [28 B]
    Get:7 http://security.ubuntu.com/ubuntu xenial-security/universe i386 Packages [28 B]
    Get:8 http://security.ubuntu.com/ubuntu xenial-security/multiverse amd64 Packages [28 B]
    Get:9 http://security.ubuntu.com/ubuntu xenial-security/multiverse i386 Packages [28 B]
    Get:10 http://security.ubuntu.com/ubuntu xenial-security/multiverse Translation-en [28 B]
    Get:11 http://gb.archive.ubuntu.com/ubuntu xenial/main amd64 Packages [1,201 kB]
    Get:12 http://gb.archive.ubuntu.com/ubuntu xenial/main i386 Packages [1,196 kB]
    Get:13 http://gb.archive.ubuntu.com/ubuntu xenial/main Translation-en_GB [426 kB]
    Get:14 http://gb.archive.ubuntu.com/ubuntu xenial/main Translation-en [568 kB]
    Get:15 http://gb.archive.ubuntu.com/ubuntu xenial/main amd64 DEP-11 Metadata [733 kB]
    Get:16 http://gb.archive.ubuntu.com/ubuntu xenial/main DEP-11 64x64 Icons [409 kB]
    Get:17 http://gb.archive.ubuntu.com/ubuntu xenial/restricted amd64 Packages [8,344 B]
    Get:18 http://gb.archive.ubuntu.com/ubuntu xenial/restricted i386 Packages [8,684 B]
    Get:19 http://gb.archive.ubuntu.com/ubuntu xenial/restricted Translation-en_GB [2,556 B]
    Get:20 http://gb.archive.ubuntu.com/ubuntu xenial/restricted Translation-en [2,908 B]
    Get:21 http://gb.archive.ubuntu.com/ubuntu xenial/restricted amd64 DEP-11 Metadata [186 B]
    Get:22 http://gb.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages [7,532 kB]
    Get:23 http://gb.archive.ubuntu.com/ubuntu xenial/universe i386 Packages [7,512 kB]
    Get:24 http://gb.archive.ubuntu.com/ubuntu xenial/universe Translation-en_GB [3,040 kB]
    Get:25 http://gb.archive.ubuntu.com/ubuntu xenial/universe Translation-en [4,354 kB]
    Get:26 http://gb.archive.ubuntu.com/ubuntu xenial/universe amd64 DEP-11 Metadata [3,410 kB]
    Get:27 http://gb.archive.ubuntu.com/ubuntu xenial/universe DEP-11 64x64 Icons [7,448 kB]
    Get:28 http://gb.archive.ubuntu.com/ubuntu xenial/multiverse amd64 Packages [144 kB]
    Get:29 http://gb.archive.ubuntu.com/ubuntu xenial/multiverse i386 Packages [140 kB]
    Get:30 http://gb.archive.ubuntu.com/ubuntu xenial/multiverse Translation-en_GB [88.1 kB]
    Get:31 http://gb.archive.ubuntu.com/ubuntu xenial/multiverse Translation-en [106 kB]
    Get:32 http://gb.archive.ubuntu.com/ubuntu xenial/multiverse amd64 DEP-11 Metadata [63.8 kB]
    Get:33 http://gb.archive.ubuntu.com/ubuntu xenial/multiverse DEP-11 64x64 Icons [230 kB]
    Get:34 http://gb.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages [28 B]
    Get:35 http://gb.archive.ubuntu.com/ubuntu xenial-updates/main i386 Packages [28 B]
    Get:36 http://gb.archive.ubuntu.com/ubuntu xenial-updates/main Translation-en [28 B]
    Get:37 http://gb.archive.ubuntu.com/ubuntu xenial-updates/restricted amd64 Packages [28 B]
    Get:38 http://gb.archive.ubuntu.com/ubuntu xenial-updates/restricted i386 Packages [28 B]
    Get:39 http://gb.archive.ubuntu.com/ubuntu xenial-updates/restricted Translation-en [28 B]
    Get:40 http://gb.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 Packages [28 B]
    Get:41 http://gb.archive.ubuntu.com/ubuntu xenial-updates/universe i386 Packages [28 B]
    Get:42 http://gb.archive.ubuntu.com/ubuntu xenial-updates/universe Translation-en [28 B]
    Get:43 http://gb.archive.ubuntu.com/ubuntu xenial-updates/multiverse amd64 Packages [28 B]
    Get:44 http://gb.archive.ubuntu.com/ubuntu xenial-updates/multiverse i386 Packages [28 B]
    Get:45 http://gb.archive.ubuntu.com/ubuntu xenial-updates/multiverse Translation-en [28 B]
    Get:46 http://gb.archive.ubuntu.com/ubuntu xenial-backports/main amd64 Packages [28 B]
    Get:47 http://gb.archive.ubuntu.com/ubuntu xenial-backports/main i386 Packages [28 B]
    Get:48 http://gb.archive.ubuntu.com/ubuntu xenial-backports/main Translation-en [28 B]
    Get:49 http://gb.archive.ubuntu.com/ubuntu xenial-backports/restricted amd64 Packages [28 B]
    Get:50 http://gb.archive.ubuntu.com/ubuntu xenial-backports/restricted i386 Packages [28 B]
    Get:51 http://gb.archive.ubuntu.com/ubuntu xenial-backports/restricted Translation-en [28 B]
    Get:52 http://gb.archive.ubuntu.com/ubuntu xenial-backports/universe amd64 Packages [28 B]
    Get:53 http://gb.archive.ubuntu.com/ubuntu xenial-backports/universe i386 Packages [28 B]
    Get:54 http://gb.archive.ubuntu.com/ubuntu xenial-backports/universe Translation-en [28 B]
    Get:55 http://gb.archive.ubuntu.com/ubuntu xenial-backports/multiverse amd64 Packages [28 B]
    Get:56 http://gb.archive.ubuntu.com/ubuntu xenial-backports/multiverse i386 Packages [28 B]
    Get:57 http://gb.archive.ubuntu.com/ubuntu xenial-backports/multiverse Translation-en [28 B]
    Fetched 39.0 MB in 7min 59s (81.3 kB/s)
    AppStream cache update completed, but some metadata was ignored due to errors.
    Reading package lists... Done

And when running "sudo appstreamcli refresh --force --verbose" the output is as follows:

    ** (appstreamcli:2227): DEBUG: Refreshing AppStream cache
    ** (appstreamcli:2227): DEBUG: Reading: /usr/share/app-info/xmls/org.freedesktop.fwupd.xml
    ** (appstreamcli:2227): DEBUG: Reading: /var/lib/app-info/yaml/gb.archive.ubuntu.com_ubuntu_dists_xenial_universe_dep11_Components-amd64.yml.gz
    ** (appstreamcli:2227): DEBUG: Reading: /var/lib/app-info/yaml/gb.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_dep11_Components-amd64.yml.gz
    ** (appstreamcli:2227): DEBUG: Reading: /var/lib/app-info/yaml/gb.archive.ubuntu.com_ubuntu_dists_xenial_multiverse_dep11_Components-amd64.yml.gz
    ** (appstreamcli:2227): DEBUG: Reading: /var/lib/app-info/yaml/gb.archive.ubuntu.com_ubuntu_dists_xenial_main_dep11_Components-amd64.yml.gz
    ** (appstreamcli:2227): DEBUG: Reading: /var/lib/app-info/yaml/gb.archive.ubuntu.com_ubuntu_dists_xenial_restricted_dep11_Components-amd64.yml.gz
    ** (appstreamcli:2227): DEBUG: Reading: /var/lib/app-info/yaml/gb.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_dep11_Components-amd64.yml.gz
    ** (appstreamcli:2227): DEBUG: Reading: /var/lib/app-info/yaml/gb.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_dep11_Components-amd64.yml.gz
    ** (appstreamcli:2227): DEBUG: Reading: /var/lib/app-info/yaml/gb.archive.ubuntu.com_ubuntu_dists_xenial-updates_multiverse_dep11_Components-amd64.yml.gz
    ** (appstreamcli:2227): DEBUG: Reading: /var/lib/app-info/yaml/security.ubuntu.com_ubuntu_dists_xenial-security_main_dep11_Components-amd64.yml.gz
    ** (appstreamcli:2227): DEBUG: Reading: /var/lib/app-info/yaml/security.ubuntu.com_ubuntu_dists_xenial-security_restricted_dep11_Components-amd64.yml.gz
    ** (appstreamcli:2227): DEBUG: Reading: /var/lib/app-info/yaml/security.ubuntu.com_ubuntu_dists_xenial-security_universe_dep11_Components-amd64.yml.gz
    ** (appstreamcli:2227): DEBUG: Reading: /var/lib/app-info/yaml/security.ubuntu.com_ubuntu_dists_xenial-security_multiverse_dep11_Components-amd64.yml.gz
    ** (appstreamcli:2227): DEBUG: Reading: /var/cache/app-info/xmls/fwupd.xml
    ** (appstreamcli:2227): DEBUG: Detected colliding ids: plan.desktop was already added with the same priority.
    ** (appstreamcli:2227): DEBUG: Detected colliding ids: flcheckers.desktop was already added with the same priority.
    ** (appstreamcli:2227): DEBUG: Detected colliding ids: flblocks.desktop was already added with the same priority.
    ** (appstreamcli:2227): DEBUG: Detected colliding ids: flsudoku.desktop was already added with the same priority.
    ** (appstreamcli:2227): DEBUG: zathura-pdf-poppler.desktop extends zathura.desktop, but zathura.desktop was not found.
    ** (appstreamcli:2227): DEBUG: WARNING: Skipped component 'com.steelseries.rival-legacy.firmware': The component is invalid.
    ** (appstreamcli:2227): DEBUG: Removing old rebuild-dir from previous database rebuild.
    AppStream cache update completed, but some metadata was ignored due to errors.

I have found this to be present on all Ubuntu 16.04 flavours which I have tried, I have also been informed that this is likely to be a server-side issue.