I've upgraded from Ubuntu 11.10 to 12.04 and used the KDE human theme in 11.10.
After upgrade I switched back to oxygen-icon-theme and many KDE icons are still missing.
I've already tried to reinstall oxygen-icon-theme.
Here a screenshot from German Krusader menu. You see a lot of icons missing.
How to restore default Ubuntu 12.04 KDE icons?