I upgraded from KDE 4 to KDE 5. Various icons are wrong. It seems to be specific to existing user profiles, because the correct icons are used in a freshly created user profile with an empty home directory and no configuration files. I already deleted all files from /var/tmp/kde-cache-*/, /tmp/kde-*, ~/.thumbnails and ~/.cache while KDE was not running, but it did not change anything. In the following screenshots pay attention to the symbol of the Trash plasmoid (upper left corner) and the symbol for the Kate application in the start menu. Existing user profile with wrong icons: https://www.dropbox.com/s/468gv2us67bnlly/Screenshot-Desktop-Existing-User.png?dl=0 A fresh user profile with correct icons: https://www.dropbox.com/s/vs828dj2k6bbzgm/Screenshot-Desktop-New-User.png?dl=0
In the affected user, does switching the icon or workspace theme get things back to normal?
I have already tried this and, no, it does not help. Even after switching to a different theme and back, the icons are still wrong. Sorry that I forgot to mention that point. If the solution was so trivial, I would not have submitted a bug report.
Plasma-5.6.5 is arch and 5.7.3 ~arch, is this still a thing? If this is just a local issue caused by some config peculiarities, there's nothing that can be done here I'm afraid. Look into ~/.local/share/icons and make sure there is no cruft.
(In reply to Andreas Sturmlechner from comment #3) > Plasma-5.6.5 is arch and 5.7.3 ~arch, is this still a thing? If this is just > a local issue caused by some config peculiarities, there's nothing that can > be done here I'm afraid. Look into ~/.local/share/icons and make sure there > is no cruft. Please report back.
Still the same issue. The day before yesterday I did a world update and now I am running on KDE Plasma 5.7.5, KDE Apps 16.04.03 and KDE Frameworks 5.26. I did the world update from the console with the window manager running. After that I deleted nearly everything under ~/.cache that somehow related to KDE or Plasma, /tmp/kde-<username> and I also had a look into ~/.local/share/icons. Then I started the freshly updated KDE and logged into my normal user account for the first time. Icons are different now but still messed up. Some icons that were wrong before are correct now, while other icons that had been correct became wrong. :-(
Given the fact that it works in a fresh user but not in your user that upgrade from 4 -> this is almost certainly an old configuration issue. Unfortunately KDE is notorious for this kind of issue and there is usually little resolution beyond removing old config files until it works. It could be worth moving ~/.kde4 and failing that even ~/.config and ~/.local to a temporary safe location to try and track down the offending file. You could also try running 'strace plasmawindowed org.kde.plasma.kickoff' to see if that reveals anything about what it's trying to access.
