Install kdegraphics-thumbnailers by entering the following commands in the terminal:
sudo apt update sudo apt install kdegraphics-thumbnailers
Description:
graphics file format thumbnailers for KDE SC
These plugins allow KDE software to create thumbnails for several advanced graphic file formats (PS, RAW). . This package is part of the KDE graphics module.
Homepage: http://www.kde.org/
Version: 4:17.12.3-0ubuntu1
Section: universe/kde