In my case, plasmashell started crashing like this after I had some problems with printing a document two days back. When I started the PC today (Kubuntu 18.04), plasmashell would keep crashing with the error messages outlined above.
After reading this bug report, I did some digging and found the following:
- One of the attempts of printing the document apparently resulted in a "stuck" print job in CUPS
- That job was listed twice with the same ID
- I could cancel one of them, but not the other one, as it had the same ID
- After manually removing the stuck job from /var/spool/cups and rebooting the PC, everything worked again
- Strangely enough, one of the two printers I had previously configured has now vanished completely from CUPS
So, the root cause seems to lie in CUPS rather than KDE, but I find it extremely puzzling that an error in CUPS keeps KDE from starting properly - this seems to be a bug in itself.
Another +1
In my case, plasmashell started crashing like this after I had some problems with printing a document two days back. When I started the PC today (Kubuntu 18.04), plasmashell would keep crashing with the error messages outlined above.
After reading this bug report, I did some digging and found the following:
- One of the attempts of printing the document apparently resulted in a "stuck" print job in CUPS
- That job was listed twice with the same ID
- I could cancel one of them, but not the other one, as it had the same ID
- After manually removing the stuck job from /var/spool/cups and rebooting the PC, everything worked again
- Strangely enough, one of the two printers I had previously configured has now vanished completely from CUPS
So, the root cause seems to lie in CUPS rather than KDE, but I find it extremely puzzling that an error in CUPS keeps KDE from starting properly - this seems to be a bug in itself.