It's quite interesting to submit a bug report without a working window manager, but I think this may be related to the commit https://salsa.debian.org/qt-kde-team/kde/kscreenlocker/-/commit/2320b40c8d6f3ba316c83a31bdba79dc8db6d208 not listing the symbol _ZN12ScreenLocker7KSldApp30greeterClientConnectionChangedEvy . I am not sure if there are any other symbols which might be needed.
- Bug#974538: libkscreenlocker5: kwin cannot start du... Ben Wagner
- Bug#974538: Ben Wagner
- Bug#974538: libkscreenlocker5: kwin cannot sta... Alexander Kernozhitsky
- Bug#974538: libkscreenlocker5: kwin cannot sta... Ben Wagner
- Bug#974538: libkscreenlocker5: kwin cannot sta... Norbert Preining
- Bug#974538: libkscreenlocker5: kwin cannot... Aurélien COUDERC
