SUMMARY After updating, at reboot, there's just a black screen STEPS TO REPRODUCE 1. Update 2. Reboot 3. Dark screen OBSERVED RESULT After updating my Debian testing (listbugs highlighted there was a critical bug in kwin but I updated anyway) I can't see any desktop, just a dark screen EXPECTED RESULT Properly work SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: (available in About System) KDE Plasma Version: 5.17 KDE Frameworks Version: Qt Version: ADDITIONAL INFORMATION I can't even run update from konsole, it seems it doesn't connect
We don't support 5.17 anymore. There was a bug recently where debian testing shipped kwin and kdecoration with different versions, it might be the issue, see https://bugs.kde.org/show_bug.cgi?id=428897 for more details. Otherwise, please update your plasma installation to either 5.18 or 5.20.