Public bug reported:

plasmashell kept crashing with segmentation fault.
(plasma-workspace 4:5.14.5-0ubuntu1~ubuntu1)
Removing .kde, .config, .local, using a different user.  All results were the 
same

So I did a backtrace:


raul@nostromo:~$ gdb plasmashell
GNU gdb (Ubuntu 8.2-0ubuntu1) 8.2
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For help, type "help".                                                          
                                                                                
                        
Type "apropos word" to search for commands related to "word"...                 
                                                                                
                        
Lendo símbolos de plasmashell...(no debugging symbols found)...concluído.       
                                                                                
                        
(gdb) run                                                                       
                                                                                
                        
Starting program: /usr/bin/plasmashell                                          
                                                                                
                        
[Thread debugging using libthread_db enabled]                                   
                                                                                
                        
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".      
                                                                                
                        
[New Thread 0x7fffed9ce700 (LWP 19067)]                                         
                                                                                
                        
[New Thread 0x7fffe7fff700 (LWP 19068)]                                         
                                                                                
                        
[New Thread 0x7fffe6dee700 (LWP 19069)]                                         
                                                                                
                        
org.kde.plasmaquick: Applet preload policy set to 1                             
                                                                                
                        
file:///usr/share/plasma/plasmoids/org.kde.desktopcontainment/contents/ui/main.qml:61:28:
 Unable to assign [undefined] to int                                            
               
file:///usr/share/plasma/plasmoids/org.kde.desktopcontainment/contents/ui/main.qml:52:27:
 Unable to assign [undefined] to int                                            
               
trying to show an empty dialog                                                  
                                                                                
                        
file:///usr/share/plasma/plasmoids/org.kde.desktopcontainment/contents/ui/main.qml:61:28:
 Unable to assign [undefined] to int                                            
               
file:///usr/share/plasma/plasmoids/org.kde.desktopcontainment/contents/ui/main.qml:52:27:
 Unable to assign [undefined] to int                                            
               
trying to show an empty dialog                                                  
                                                                                
                        
[New Thread 0x7fffd7fff700 (LWP 19072)]                                         
                                                                                
                        
[New Thread 0x7fffcffff700 (LWP 19073)]                                         
                                                                                
                        
Connecting to deprecated signal 
QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)          
                                                                        
Trying to use rootObject before initialization is completed, whilst using 
setInitializationDelayed. Forcing completion                                    
                              
Both point size and pixel size set. Using pixel size.                           
                                                                                
                        
Both point size and pixel size set. Using pixel size.                           
                                                                                
                        
Both point size and pixel size set. Using pixel size.                           
                                                                                
                        
trying to show an empty dialog                                                  
                                                                                
                        
trying to show an empty dialog                                                  
                                                                                
                        
Trying to use rootObject before initialization is completed, whilst using 
setInitializationDelayed. Forcing completion                                    
                              
Failed to find service for Unity Launcher "application://Franz.desktop"         
                                                                                
                        
[Detaching after fork from child process 19077]                                 
                                                                                
                        
Trying to use rootObject before initialization is completed, whilst using 
setInitializationDelayed. Forcing completion                                    
                              
kde.dataengine.notifications`: Failed to register Notifications service         
                                                                                
                        
[New Thread 0x7fffc2df7700 (LWP 19079)]                                         
                                                                                
                        
libkcups: Create-Printer-Subscriptions last error: 0 successful-ok              
                                                                                
                        
libkcups: Get-Jobs last error: 0 successful-ok                                  
                                                                                
                        
libkcups: Get-Jobs last error: 0 successful-ok                                  
                                                                                
                        
[Detaching after fork from child process 19080]                                 
                                                                                
                        
inotify_add_watch("/var/lib/PackageKit/offline-update-action") failed: "No such 
file or directory"                                                              
                        
[New Thread 0x7fffc146e700 (LWP 19082)]                                         
                                                                                
                        
[New Thread 0x7fffc0c58700 (LWP 19083)]                                         
                                                                                
                        
[New Thread 0x7fffb3fff700 (LWP 19084)]                                         
                                                                                
                        
[New Thread 0x7fffb37fe700 (LWP 19085)]                                         
                                                                                
                        
org.kde.plasmaquick: New Applet  "Application Launcher" with a weight of 75     
                                                                                
                        
org.kde.plasmaquick: New Applet  "Digital Clock" with a weight of 0             
                                                                                
                        
Plasma Shell startup completed                                                  
                                                                                
                        
libkcups: 10                                                                    
                                                                                
                        

Thread 1 "plasmashell" received signal SIGSEGV, Segmentation fault.             
                                                                                
                        
0x00007fffc3d6991e in JobModel::updateJob(int, KCupsJob const&) () from 
/usr/lib/x86_64-linux-gnu/libkcupslib.so                                        
                                
(gdb) bt                                                                        
                                                                                
                        
#0  0x00007fffc3d6991e in JobModel::updateJob(int, KCupsJob const&) () at 
/usr/lib/x86_64-linux-gnu/libkcupslib.so                                        
                              
#1  0x00007fffc3d6bec7 in JobModel::getJobFinished(KCupsRequest*) () at 
/usr/lib/x86_64-linux-gnu/libkcupslib.so                                        
                                
#2  0x00007ffff5d3df92 in QObject::event(QEvent*) () at 
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5                                       
                                                
#3  0x00007ffff68494a1 in QApplicationPrivate::notify_helper(QObject*, QEvent*) 
() at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5                              
                        
#4  0x00007ffff6850ae0 in QApplication::notify(QObject*, QEvent*) () at 
/usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5                                    
                                
#5  0x00007ffff5d14499 in QCoreApplication::notifyInternal2(QObject*, QEvent*) 
() at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5                                 
                         
#6  0x00007ffff5d1748b in QCoreApplicationPrivate::sendPostedEvents(QObject*, 
int, QThreadData*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5              
                          
#7  0x00007ffff5d66b23 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5      
                                                                                
                        
#8  0x00007ffff2ec0c3e in g_main_context_dispatch () at 
/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0                                      
                                                
#9  0x00007ffff2ec0ed8 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0     
                                                                                
                        
#10 0x00007ffff2ec0f6c in g_main_context_iteration () at 
/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0                                      
                                               
#11 0x00007ffff5d66143 in 
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () 
at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5                                    
#12 0x00007fffee9a5e51 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5    
                                                                                
                        
#13 0x00007ffff5d1316b in 
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at 
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5                                       
                
#14 0x00007ffff5d1b2e2 in QCoreApplication::exec() () at 
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5                                       
                                               
#15 0x000055555557419b in  ()                                                   
                                                                                
                        
#16 0x00007ffff575909b in __libc_start_main (main=                              
                                                                                
                        
    0x555555573690, argc=1, argv=0x7fffffffda08, init=<optimized out>, 
fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffd9f8) at 
../csu/libc-start.c:308            
#17 0x000055555557461a in _start ()                                             
                                                                                
                        
(gdb) quit                                   

$ dpkg -S /usr/lib/x86_64-linux-gnu/libkcupslib.so
print-manager: /usr/lib/x86_64-linux-gnu/libkcupslib.so

$ sudo apt remove print-manager

and plasmashell worksagain.-

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: print-manager (not installed)
Uname: Linux 4.18.20-041820-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.10-0ubuntu13.1
Architecture: amd64
CurrentDesktop: KDE
Date: Thu Jan 31 11:51:01 2019
InstallationDate: Installed on 2014-05-12 (1725 days ago)
InstallationMedia: Error: [Errno 13] Permissão negada: 
'/var/log/installer/media-info'
SourcePackage: print-manager
UpgradeStatus: Upgraded to cosmic on 2018-10-22 (101 days ago)

** Affects: print-manager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug cosmic

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https://bugs.launchpad.net/bugs/1814106

Title:
  plasmashell segs fault with print-manager

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