Problem may be temporarily fixed by the solution from https://askubuntu.com/a/1068567/66509 :
sudo apt-get install qml-module-qtquick-controls -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1788863 Title: Plasma Discover does not start because of missing QtQuick.Controls To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/plasma-discover/+bug/1788863/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
