SUMMARY
Error during system update  

NOTE: If you are reporting a crash, please try to attach a backtrace with debug symbols.
See https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports
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STEPS TO REPRODUCE
1. Muon Paketverwaltung   Muon/ Muon   -> Error
2. New start Kubuntu  -> Error     
3. Recover mode -> Work is possible

OBSERVED RESULT
System start is now only possible if Kubuntu is started manually via bios using Recovermode.

EXPECTED RESULT
System start-up should be possible again without having to select an old, still functioning Recover version.
Kernel-Version: 5.15.0.72-generic  instead  .....0.73 

SOFTWARE/OS VERSIONS
Kubuntu: 20.04
LINUX/KDE Plasma-Version: 5.18.8.
KDE-Framworks-Version 5.68.0
QT-Version: 5.12.8
Kernel-Version: 5.15.0.72-generic

ADDITIONAL INFORMATION
It seems that no successful mount point could be created when the system update was completed.