SUMMARY STEPS TO REPRODUCE 1. navigate to a folder with images 2. menu: View > Show previews EXPECTED RESULT preview images, show thumbnails ACTUAL RESULT no thumbnails SOFTWARE VERSIONS (available in About System) KDE Plasma Version: n.a. KDE Frameworks Version: n.a. Qt Version: XFCE version 4.12 OS: Ubuntu Studio 18.04 ADDITIONAL INFORMATION The 'show previews' worked just fine in 16.04 I just upgraded to 18.04 and there's no preview of images. although, when pressing F3, images are properly displayed in KrViewer
The same thing happens on my laptop, where the same upgrade was performed a few days ago. No (thumbnail) previews of photos or any other docs.
You need to have the package "kio-extras" installed.
Thank you! This solved the problem, indeed. I was searching everywhere, couldn't find a solution. I hope this would help other people.