k3b cannot create file in kubuntu since 19.10 upgrade

Settings -> Configure k3b -> programs -> Permissions "tab" Modify permissions to be able to burn cd/dvd or data.
K3B setup -> KDE Control module.. https://userbase.kde.org/images.userbase/0/07/K3bsetup.png

https://userbase.kde.org/K3b

After the upgrade to 19.10, you will need to reset-up K3B again. If root access is the permission set.
You will need to be in root to burn a data cd/dvd. Perhaps you have already went through all of the settings.
Certain kernel changes act differently with each motherboard and processor. They can have different actions on
other programs. Hopefully it is just in the settings, otherwise it could be in the kb3 package.

If you stick to the package ls in the repos rather than the ones you find online you'll probably find the OS works as expected

I am using the official Kubuntu backports repository. It was recommended by the Kubuntu team because a new version of KDE came out just after 19.10 was released.

k3b says its permissions are correct, so it doesn't look like a k3b problem.

However, I did get some dbus errors earlier. Somehow the way a program asks KDE to get access to the filesystem is broken.

So k3b cannot create the file list in /tmp/k3b.sZLsZL (above). When it passed that to genisoimage, there is no file to read.

Still comes with the same caveats of a PPA. What is in the newer version of KDE that you need?

I am not sure that it is the PPA. It seems to have started on the upgrade of an existing Kubuntu 19.04 to Kubuntu 19.10, as opposed to a fresh install.

The versions I am using are:

[System] K3b Version: 19.12.2
[System] KDE Version: 5.66.0
[System] Qt Version: 5.12.4

Is there some way of testing what is happening underneath k3b inside KDE?

I checked /var/log/syslog and dmesg but didn't find anything relevant. Is there a log file specific to KDE?

What is the output of the commands

uname -a
lsb_release -crid
apt-cache policy k3b libqt5core5a kio

uname -a gives:

Linux dave-AB350 5.3.0-26202001131313-generic #0+mediatree+hauppauge-Ubuntu SMP Mon Jan 20 22:01:08 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

(although I get the same behaviour with 5.3.0-29-generic)

lsb_release -crid gives:

Distributor ID: Ubuntu
Description: Ubuntu 19.10
Release: 19.10
Codename: eoan

apt-cache policy k3b libqt5core5a kio gives:

k3b:
  Installed: 19.12.2-0ubuntu1~ubuntu19.10~ppa1
  Candidate: 19.12.2-0ubuntu1~ubuntu19.10~ppa1
  Version table:
 *** 19.12.2-0ubuntu1~ubuntu19.10~ppa1 500
        500 http://ppa.launchpad.net/kubuntu-ppa/backports/ubuntu eoan/main amd64 Packages
        100 /var/lib/dpkg/status
     19.04.3-0ubuntu1 500
        500 http://mirror.ox.ac.uk/sites/archive.ubuntu.com/ubuntu eoan/universe amd64 Packages
libqt5core5a:
  Installed: 5.12.4+dfsg-4ubuntu1
  Candidate: 5.12.4+dfsg-4ubuntu1
  Version table:
 *** 5.12.4+dfsg-4ubuntu1 500
        500 http://mirror.ox.ac.uk/sites/archive.ubuntu.com/ubuntu eoan/universe amd64 Packages
        100 /var/lib/dpkg/status
kio:
  Installed: 5.67.0-0ubuntu1~ubuntu19.10~ppa2
  Candidate: 5.67.0-0ubuntu1~ubuntu19.10~ppa2
  Version table:
 *** 5.67.0-0ubuntu1~ubuntu19.10~ppa2 500
        500 http://ppa.launchpad.net/kubuntu-ppa/backports/ubuntu eoan/main amd64 Packages
        100 /var/lib/dpkg/status
     5.62.1-0ubuntu1 500
        500 http://mirror.ox.ac.uk/sites/archive.ubuntu.com/ubuntu eoan/universe amd64 Packages

You have installed k3b and kde from a PPA.
Please contact the provider of that PPA if you have problems with the software in it.

see https://launchpad.net/~kubuntu-ppa/+archive/ubuntu/backports
"For questions and bugs with software in this PPA please contact Kubuntu Package Archives."

The version is from a PPA. It's not the official package from the Ubuntu repositories which will more than likely work.

How can I downgrade to the release version?

You can try ppa-purge