I cleaned out /var/cache/apt/archives.
Regarding the qml-module-org-kde packages, since I don't use kactivities I did not worry about losing qml-module-org-kde-activities. As a result I have
root@Hibiscus:/# apt-cache policy qml-module-org-kde-activities
qml-module-org-kde-activities:
Installed: (none)
Candidate: 5.15.0-siduction1
Version table:
5.15.0-siduction1 500
500 http://packages.siduction.org/kdenext unstable/main amd64 Packages
root@Hibiscus:/# apt-cache policy qml-module-org-kde-extensionplugin
qml-module-org-kde-extensionplugin:
Installed: 5.16.0-1
Candidate: 5.16.0-1
Version table:
*** 5.16.0-1 500
500 http://httpredir.debian.org/debian unstable/main amd64 Packages
100 /var/lib/dpkg/status
5.15.0-siduction1 500
500 http://packages.siduction.org/kdenext unstable/main amd64 Packages
In this morning's d-u, okular was removed, but there were no other issues. The system was running stable since Friday night. Today I rebooted because of the new kernel.
root@Hibiscus:/# uptime
10:34:40 up 1:50, 1 user, load average: 0.09, 0.16, 0.22