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I get
every few minutes on Kubuntu (KDE), and the panels disappear.
It restarts itself automatically, so it's not a real problem, just an annoyance, but it is a big annoyance.
I've tried sudo apt install --reinstall plasmashell plasma-desktop, but that made no difference.
When I try a backtrace from the error message, it says it's unable to produce a useful backtrace.
Try installing the latest version of Plasma as a backport:
sudo apt-add-repository ppa:kubuntu-ppa/backports
sudo apt update && sudo apt full-upgrade -y
First, if you have any non-standard plasma widgets, I would try to remove those.
Then, I would kill plasmashell process and then run it from the command line to see the full debug output.
to get a useful backtrace you need to install the *-dev related packages.
about widgets: potentially removing your whole panel, or widgets on your background and recreating a new panel if you want. is an option.
finally, you could inspecting your local plasma related config files.
$ find .config/ | grep plasma
.config/plasma-localerc
.config/plasmavaultrc
.config/plasma-org.kde.plasma.desktop-appletsrc
.config/plasmanotifyrc
.config/plasmarc
.config/plasmawindowedrc
.config/plasmawindowed-appletsrc
.config/plasmashellrc
.config/plasma-nm
you could back them up and move them away between restarts. I would start by .config/plasma-org.kde.plasma.desktop-appletsrc
hope this helps
