Bug 427493

Summary: Kwin crashes after login with symbol lookup error
Product: [KDE Neon] neon Reporter: Terces86
Component: generalAssignee: Neon Bugs <neon-bugs>
Status: RESOLVED DUPLICATE    
Severity: major CC: fknghostile, hernan.hyper, jr, neon-bugs, roninhomc, sitter
Priority: NOR    
Version First Reported In: unspecified   
Target Milestone: ---   
Platform: Neon   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:

Description Terces86 2020-10-09 16:45:17 UTC 
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
Comment 1 Terces86 2020-10-09 17:40:24 UTC 
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"
Comment 2 Hernan Schmidt 2020-10-09 18:10:02 UTC 
I can confirm the reported bug and the solution proposed.
Comment 3 fknghostile 2020-10-09 19:12:08 UTC 
Same problem here.
Comment 4 Christoph Feck 2020-10-10 05:06:28 UTC 

*** This bug has been marked as a duplicate of bug 427498 ***
Comment 5 Roni 2020-10-14 00:01:00 UTC 
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.
Comment 6 Roni 2020-10-14 00:41:45 UTC 
After install kwin, solved to me. "sudo apt install kwin"