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Hi, yesterday I updated to Plasma 5.8
After successful installation and consequent restart, my panel disappeared from the desktop.
I tried to delete, restart and recreate all KDE related configs, but that didn't help.
I also tried to add new panel (as well as default panel) to the desktop. Nevertheless, nothing has happened - panel(s) haven't appeared.
The only thing I can do, is add widgets to the desktop from the list of available widgets. There I can see that 4x instances of application launcher, pager, etc. are running, because I tried to start panel four times.
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This trick worked for me when I was having problems with panels. It's better to logout of Plasma workspace when following these steps.
In addition to the related configs, remove KDE/Plasma related stuff from .cache and .local folders as well.
Also make sure you have removed this file - ~/.config/plasma-org.kde.plasma.desktop-appletsrc
Run
kbuildsycoca5
When you login, hopefully the problems would have been fixed.
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