SUMMARY After todays update kwin can't launch and thus the user is starting on a black screen. Programs can be launched through KRunner or Terminal, but don't have any borders. All Panels are missing. STEPS TO REPRODUCE 1. Update System 2. Restart 3. Login OBSERVED RESULT - Missing background - programs can only be launched with KRunner or through terminal (they lack borders and can't be moved) - no panels - starting Kwin manually returns error: "kwin: symbol lookup error: /usr/lib/x86_64-linux-gnu/libkwin.so.5: undefined symbol: _ZN14KWaylandServer17XdgShellInterface14surfaceCreatedEPNS_24XdgShellSurfaceInterfaceE" EXPECTED RESULT - Boot PC - Log into my account - Use account as usual SOFTWARE/OS VERSIONS Linux/KDE Plasma: KDE neon 20.04 5.19 KDE Plasma Version: 5.19.5 KDE Frameworks Version: 5.74.0-0xneon+20.04+focal+buil12 Qt Version: ??? ADDITIONAL INFORMATION There is also a thread in the forums of multiple users getting this error: https://forum.kde.org/viewtopic.php?f=309&t=168189
In the forum-thread the user "markfergy" traced the error back to the "libkwaylandserver5" package. Downgrading the package solved the issue: "sudo apt-get install libkwaylandserver5=5.19.5-0xneon+20.04+focal+build10"
I can confirm the reported bug and the solution proposed.
Same problem here.
*** This bug has been marked as a duplicate of bug 427498 ***
The same here. "sudo apt-get install libkwaylandserver5=5.19.5-0xneon+20.04+focal+build10" not work. Error: E: Versão '5.19.5-0xneon+20.04+focal+build10' para 'libkwaylandserver5' não foi encontrada.
After install kwin, solved to me. "sudo apt install kwin"