It’s a conflict between the Kubuntu PPA and Netrunner packages which are higher prioritized and come with a newer version and patches.
The Kubuntu Backports PPA broke the Abi compatibility with its version of plasma hence the qtcurve style cannot be updated.
I would not worry to much about it as its just a theme package and nothing security relevant or groundbreaking inner system infrastructure.
Btw. why do you have the kubuntu backports ppa with a higher priority than Netrunner PPA ?
By default we ship it the other way around which makes sense as it should avoid the issue you have here.
If you don’t want to change the priority you can list the kwin-style-qtcurve versions by executing
apt-cache policy kwin-style-qtcurveAnd then install our version (the one in the netrunner ppa) by providing its version directly like so
sudo apt-get install kwin-style-qtcurve=1.8.14-99netrunner1Thank you very much that worked !
I have the kubuntu backports ppa with a higher priority than Netrunner PPA because sometimes ago some updates from kubuntu ppa was blocked by the higher priority of Netrunner PPA. I know it’s not the best thing to do but that work pretty well.