I have some AppStream links (for ex.: appstream://org.kde.k3b.desktop) that I want to open, I tried to find an app to open them but couldn't find any, so any ideas on how to do this ?
Kubuntu's software management suite is called Discover (or plasma-discover if you're using a terminal) and is analogous to the Ubuntu Software Center (or gnome-software). Its main panel displays a list of featured applications. How is this list generated?
I am getting an error while updating as a root. After Update log below error was shown in terminal.
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
I followed this answer and executed sudo apt install appstream/xenial-backports.
My appstream package is already updated:-
$ appstreamcli --version
AppStream CLI tool version: 0.10.6
After, force refreshing the cache data. I am getting the following error:-
$ sudo appstreamcli refresh --force
AppStream system cache was updated, but problems were found: Metadata files have errors: /var/cache/app-info/xmls/fwupd.xml
How do I get rid of this?
$ sudo apt-get update
Hit:1 http://se.archive.ubuntu.com/ubuntu xenial InRelease
Hit:2 http://se.archive.ubuntu.com/ubuntu xenial-updates InRelease
Hit:3 http://download.virtualbox.org/virtualbox/debian xenial InRelease
Hit:4 http://se.archive.ubuntu.com/ubuntu xenial-backports InRelease
Hit:5 http://ppa.launchpad.net/freecad-community/ppa/ubuntu xenial InRelease
Get:6 http://security.ubuntu.com/ubuntu xenial-security InRelease [107 kB]
Hit:7 http://ppa.launchpad.net/freecad-maintainers/freecad-daily/ubuntu xenial InRelease
Hit:8 http://ppa.launchpad.net/freecad-maintainers/freecad-stable/ubuntu xenial InRelease
Hit:9 http://ppa.launchpad.net/geany-dev/ppa/ubuntu xenial InRelease
Get:10 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages [517 kB]
Hit:11 http://ppa.launchpad.net/gezakovacs/ppa/ubuntu xenial InRelease
Hit:12 http://ppa.launchpad.net/otto-kesselgulasch/gimp-edge/ubuntu xenial InRelease
Hit:13 http://ppa.launchpad.net/pmjdebruijn/darktable-release/ubuntu xenial InRelease
Hit:14 http://ppa.launchpad.net/webupd8team/java/ubuntu xenial InRelease
Get:15 http://security.ubuntu.com/ubuntu xenial-security/main i386 Packages [455 kB]
Get:16 http://security.ubuntu.com/ubuntu xenial-security/main Translation-en [221 kB]
Get:17 http://security.ubuntu.com/ubuntu xenial-security/main amd64 DEP-11 Metadata [67,7 kB]
Get:18 http://security.ubuntu.com/ubuntu xenial-security/main DEP-11 64x64 Icons [68,0 kB]
Get:19 http://security.ubuntu.com/ubuntu xenial-security/universe amd64 DEP-11 Metadata [107 kB]
Get:20 http://security.ubuntu.com/ubuntu xenial-security/universe DEP-11 64x64 Icons [142 kB]
Fetched 1 685 kB in 1s (969 kB/s)
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
$ sudo appstreamcli --version
AppStream CLI tool version: 0.10.6
$ sudo appstreamcli refresh-cache --force --verbose
** (appstreamcli:13014): DEBUG: Added /usr/share/app-info/xmls to metadata search path.
** (appstreamcli:13014): DEBUG: Added /var/lib/app-info/yaml to metadata search path.
** (appstreamcli:13014): DEBUG: Added /var/cache/app-info/xmls to metadata search path.
** (appstreamcli:13014): DEBUG: Refreshing AppStream cache
** (appstreamcli:13014): DEBUG: Searching for data in: /usr/share/app-info/xmls
** (appstreamcli:13014): DEBUG: Searching for data in: /var/cache/app-info/xmls
** (appstreamcli:13014): DEBUG: Searching for data in: /var/lib/app-info/yaml
** (appstreamcli:13014): DEBUG: Reading: /usr/share/app-info/xmls/org.freedesktop.fwupd.xml
** (appstreamcli:13014): DEBUG: Reading: /var/cache/app-info/xmls/fwupd.xml
** (appstreamcli:13014): DEBUG: WARNING: Could not parse XML data: Entity: line 265: parser error : EntityRef: expecting ';'
<checksum filename="Firmware_SF30&SN30_Pro_V1.26.dat" target="content" t
^
---SNIP-------
** (appstreamcli:13014): DEBUG: system/os/package/zathura-pdf-poppler.desktop extends system/os/package/zathura.desktop, but system/os/package/zathura.desktop was not found.
** (appstreamcli:13014): DEBUG: Error while updating the in-memory data pool: Metadata files have errors: /var/cache/app-info/xmls/fwupd.xml
** (appstreamcli:13014): 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
Looking at: Library corruption error during apt-get update The "remedies" does not help, the problem persists.
Reading this: Ubuntu 16.04: appstreamcli error while get-update ... sadly has an older version to download and install as remedy.
There's another question about AppStream that has —for better or worse— focussed on what seems to be a particular bug in AppStream but that left me realising I don't have a clue what this thing actually is.
man appstreamcli (the application taking the CPU off the deep end) throws some technical jargon at the confusion:
appstreamcli is a small helper tool to work with AppStream metadata and access the AppStream component index from the command-line. The AppStream component index contains a list of all available software components for your distribution, matched to their package names. It is generated using AppStream XML or Debian DEP-11 data, which is provided by your distributor.
So... What is it actually there for? Do all desktop (and their related package managers) use it?
By all of which I actually mean: what will break when I tear this out with my teeth?