I hardly ever use Discover ( I still prefer Muon or Synaptic for gui) but can confirm this bug still exists as described. When using cli I use pkcon refresh/update and to make sure flatpaks are updated flatpak list/flatpak update.

blue_bullet wrote:...who erroneously marked it as solved?

That would be the topic starter, Mace68.

Definitely solved, now !
viewtopic.php?f=309&t=162436&p=422626#p422605

I can confirm what David Berry wrote in the bug report. If you uninstall plasma-discover-backend-flatpak, plasma-discover stops crashing. I uninstalled it with muon. Also I noticed that if you use the built-in bug report app it doesn't install either the flatpack or snap backend dbgsym packages just the main one. @claydoh Ty for the link.

DarkFoss1 wrote:If you uninstall plasma-discover-backend-flatpak, plasma-discover stops crashing.

Gratulations to you.
But it doesn't work in my case.
I uninstalled plasma-discover-backend-flatpak with synaptic.
Discover still crashes.

I installed KDEneon yesterday.
Discover installed the updates successfully. But when I click on a button like "applications" , discover crashes.

I applied all suggested "solutions" on the bug-report-site. Nothing helps.

franzhall wrote:...when I click on a button like "applications", discover crashes.

I have the same issue, as do others, but for now all we can do is wait for the developers to fix it.

Just updated this weekend from Kubuntu to KDE Neon (with huge pain due to inexperience), the last problem seems to be Discover crashing trying to check for updates.
Not sure if it's due to my Neon unusual installation path, I was wondering if my case can be related to the problems reported in this thread.

Discover is crashing with this message

https://i.imgur.com/VZ7LIVf.png

Using CLI I got these results

Code: Select all

sudo apt update
Get:1 file:/var/cuda-repo-9-0-local InRelease
Ign:1 file:/var/cuda-repo-9-0-local InRelease
Get:2 file:/var/cuda-repo-9-0-local Release [574 B]
Get:2 file:/var/cuda-repo-9-0-local Release [574 B]
Hit:3 http://it.archive.ubuntu.com/ubuntu bionic InRelease
Hit:4 http://archive.canonical.com/ubuntu bionic InRelease
Hit:6 http://ppa.launchpad.net/kubuntu-ppa/backports/ubuntu bionic InRelease
Hit:7 http://it.archive.ubuntu.com/ubuntu bionic-updates InRelease
Ign:8 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:9 https://download.docker.com/linux/ubuntu bionic InRelease
Hit:10 http://dl.google.com/linux/chrome/deb stable Release
Hit:11 http://ppa.launchpad.net/yannubuntu/boot-repair/ubuntu bionic InRelease
Hit:12 http://it.archive.ubuntu.com/ubuntu bionic-backports InRelease
Ign:13 http://developer.download.nvidia.com...ntu1804/x86_64 InRelease
Hit:14 http://developer.download.nvidia.com...ntu1804/x86_64 Release
Get:15 http://archive.neon.kde.org/user bionic InRelease [153 kB]
Hit:16 http://security.ubuntu.com/ubuntu bionic-security InRelease
Fetched 153 kB in 1s (136 kB/s)
appstreamcli: symbol lookup error: appstreamcli: undefined symbol: AS_APPSTREAM_METADATA_PATHS
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'

Being not an expert I tried to use Muon, just trying to update at least one thing (Chrome just as experiment), and after that the apt update changed in

Code: Select all

sudo apt-get update
Get:1 file:/var/cuda-repo-9-0-local InRelease
Ign:1 file:/var/cuda-repo-9-0-local InRelease
Get:2 file:/var/cuda-repo-9-0-local Release [574 B]
Get:2 file:/var/cuda-repo-9-0-local Release [574 B]
Hit:4 http://it.archive.ubuntu.com/ubuntu bionic InRelease
Get:5 http://archive.neon.kde.org/user bionic InRelease [153 kB]
Ign:6 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:7 http://ppa.launchpad.net/kubuntu-ppa/backports/ubuntu bionic InRelease
Hit:8 http://it.archive.ubuntu.com/ubuntu bionic-updates InRelease
Hit:9 https://download.docker.com/linux/ubuntu bionic InRelease
Hit:10 http://dl.google.com/linux/chrome/deb stable Release
Hit:11 http://it.archive.ubuntu.com/ubuntu bionic-backports InRelease
Hit:12 http://ppa.launchpad.net/yannubuntu/boot-repair/ubuntu bionic InRelease
Hit:13 http://archive.canonical.com/ubuntu bionic InRelease
Hit:14 http://security.ubuntu.com/ubuntu bionic-security InRelease
Ign:15 http://developer.download.nvidia.com...ntu1804/x86_64 InRelease
Hit:16 http://developer.download.nvidia.com...ntu1804/x86_64 Release
Fetched 153 kB in 1s (129 kB/s)
appstreamcli: symbol lookup error: appstreamcli: undefined symbol: AS_APPSTREAM_METADATA_PATHS
Reading package lists... Done
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target Translations (main/i18n/Translation-it_IT) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target Translations (main/i18n/Translation-it) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target Translations (main/i18n/Translation-en_US) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target DEP-11 (main/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target DEP-11 (main/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target DEP-11-icons-small (main/dep11/icons-48x48.tar) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target DEP-11-icons (main/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target DEP-11-icons-hidpi (main/dep11/icons-64x64@2.tar) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target DEP-11-icons-large (main/dep11/icons-128x128.tar) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target Contents-deb (main/Contents-amd64) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target Contents-deb (main/Contents-all) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target CNF (main/cnf/Commands-amd64) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target CNF (main/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
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
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target Translations (main/i18n/Translation-it_IT) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target Translations (main/i18n/Translation-it) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target Translations (main/i18n/Translation-en_US) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target DEP-11 (main/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target DEP-11 (main/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target DEP-11-icons-small (main/dep11/icons-48x48.tar) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target DEP-11-icons (main/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target DEP-11-icons-hidpi (main/dep11/icons-64x64@2.tar) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target DEP-11-icons-large (main/dep11/icons-128x128.tar) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target Contents-deb (main/Contents-amd64) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target Contents-deb (main/Contents-all) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target CNF (main/cnf/Commands-amd64) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3
W: Target CNF (main/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list.d/google-chrome-beta.list:3 and /etc/apt/sources.list.d/google-chrome.list:3

Any relationship with here reported problems, due to Discover bug?

Fix should be available in all neon editions. To update use `pkcon refresh && pkcon update`.

kde-jriddell wrote:Fix should be available in all neon editions. To update use `pkcon refresh && pkcon update`.

Tested this earlier in the morning and had no updates. Discover still crashing.
Saw this post now and pkcon found updates.
Did all of them and now Discover is not crashing anymore.

Thanks for your work!

Me to my discover crash since 1 week ago and this moring i saw update so i did my 'pkcon refresh && pkcon update' restarted my computer and it still crashes

I've just installed the latest updates a few minutes ago - security updates included - and Discover is performing properly and no crashing.

I did a restart after the update just in case it made a difference and then tested it. It all seems to be fixed as far as I am concerned.

I used Synaptic to update.

Thanks, to the Developers and Jonathan.

https://bugs.kde.org/show_bug.cgi?id=411286
Status: "Resolved Fixed".

Same error I got before

Code: Select all

sudo pkcon refresh && pkcon update
Refreshing cache              [=========================]         
Loading cache                 [=========================]         
Refreshing software list      [=========================]         
Downloading packages          [=========================]         
Running                       [=========================]         
Finished                      [=========================]         
Fatal error: 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

Code: Select all

sudo apt-get update
Get:1 file:/var/cuda-repo-9-0-local  InRelease
Ign:1 file:/var/cuda-repo-9-0-local  InRelease
Get:2 file:/var/cuda-repo-9-0-local  Release [574 B]
Get:2 file:/var/cuda-repo-9-0-local  Release [574 B]                                       
Ign:3 http://dl.google.com/linux/chrome/deb stable InRelease                                         
Hit:4 http://it.archive.ubuntu.com/ubuntu bionic InRelease                                           
Hit:5 http://ppa.launchpad.net/kubuntu-ppa/backports/ubuntu bionic InRelease                         
Hit:6 http://it.archive.ubuntu.com/ubuntu bionic-updates InRelease                                   
Get:8 http://archive.neon.kde.org/user bionic InRelease [153 kB]                                     
Hit:9 http://it.archive.ubuntu.com/ubuntu bionic-backports InRelease                                 
Hit:10 http://dl.google.com/linux/chrome/deb stable Release                                         
Hit:11 https://download.docker.com/linux/ubuntu bionic InRelease                                     
Ign:12 http://developer.download.nvidia.com/compute/cuda/repos/ubuntu1804/x86_64  InRelease         
Hit:13 http://ppa.launchpad.net/yannubuntu/boot-repair/ubuntu bionic InRelease                       
Hit:14 http://security.ubuntu.com/ubuntu bionic-security InRelease                                   
Hit:15 http://archive.canonical.com/ubuntu bionic InRelease                                         
Hit:16 http://developer.download.nvidia.com/compute/cuda/repos/ubuntu1804/x86_64  Release
Fetched 153 kB in 1s (133 kB/s)                   
appstreamcli: symbol lookup error: appstreamcli: undefined symbol: AS_APPSTREAM_METADATA_PATHS
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

Code: Select all

sudo pkcon update
Getting updates               [=========================]         
Finished                      [=========================]         
Loading cache                 [=========================]         
Testing changes               [=========================]         
Finished                      [=========================]         
Fatal error: The following packages have unmet dependencies:
  phonon-backend-gstreamer: Depends: phonon-backend-gstreamer-common (= 4:4.9.0-1) but 4:4.10.0-0xneon+18.04+bionic+build8 is to be installed

Code: Select all

sudo apt-get install 4:4.10.0-0xneon+18.04+bionic+build8
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package 4:4.10.0-0xneon+18.04+bionic+build8
E: Couldn't find any package by glob '4:4.10.0-0xneon+18.04+bionic+build8'
E: Couldn't find any package by regex '4:4.10.0-0xneon+18.04+bionic+build8'

I think that this issue has now been fixed. After installing some updates this evening using muon, discover seems to be working correctly.

gfielding wrote:I think that this issue has now been fixed. After installing some updates this evening using muon, discover seems to be working correctly.

Ran synaptic one more time then had Discover update 2 Nvidia drivers and all is well for me. No reboot required.

I came back to my computer 20 minutes ago and after updating and restarting, discover works perfectly now. Thank KDE team

jeremied wrote:I came back to my computer 20 minutes ago and after updating and restarting, discover works perfectly now. Thank KDE team

Same here. Problem definitely solved i guess.