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Since a few days I have the problem that after the start of my system only for a moment the desktop is visible (in fact, only the background image) and then plasma crashes. Everything else works fine, so I can start any application using KRunner, for example.

Some information:

  • Kubuntu 18.04
  • KDE Plasma 5.12.7
  • KDE Framework 5.44.0
  • Qt 5.9.5
  • Kernel 4.15.0-45-generic (but the problem also exists under an older kernel)

What did I try:

  • Added last packages removed via apt-get autoremove (x11proto-dri2-dev:amd64 and x11proto-gl-dev:amd64)
  • System update
  • Disable startup programs
  • Reset to default settings (plasma-org.kde.plasma.desktop-appletsrc, plasmarc and plasmashellrc removed)
  • Create new user

Currently, I suspect the reason for my problem somewhere in the last updates made. The last packages that were updated before the problem occurred were: libcurl4:amd64, spotify-client:amd64 and libcurl3-gnutls:amd64.

I appreciate any help.

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I found the (somewhat surprising) solution: Blocked print jobs in CUPS killed the complete desktop environment! So, if someone faces the same problem:

  1. Go to the CUPS server or to the print manager and remove all print jobs that have stopped or
  2. run lprm -
  3. Check if all print jobs could be removed! In my case, some jobs could not be removed. They belonged to a printer with a suspicious configuration, so in the end I simply removed the entire printer.

Hope it helps!

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Had the same problem with an OpenSuse-Distro (Leap 15). Plasma desktop disappeared after a few seconds. When I disabled cups-server with

"systemctl disable cups" and reboot then plasma do not crash. Procedure:

1) Ctrl-Alt-F1 -> get a Console and logged in as root

2) "systemctl start cups" and "systemctl enable cups" (cups-server is running now and plasma-desktop crashed again - in OpenSuse you can see it with Ctrl-Alt-F7)

3) lpq -> view the printer jobs queue for entries

4) lprm [jobID] -> removed the halted jobs and reboot

Hope it helps somebody with the same problem

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