Install liboxygenstyle5-5 by entering the following commands in the terminal:
sudo apt update sudo apt install liboxygenstyle5-5
Description:
style library for the Oxygen desktop theme
The Oxygen desktop theme is used by Plasma and other KDE Software. . This package contains the private library used by the widget theme and KWin style.
Homepage: https://projects.kde.org/projects/kde/workspace/oxygen
Version: 4:5.12.4-0ubuntu1
Section: universe/kde