Created attachment 121281 [details] Screenshot of the opened ebook editor. SUMMARY Possible name conflict between 'Look and Feel' package previewer and calibre's tools (ebook editor). Consider exploring '*tweak*' named programs. STEPS TO REPRODUCE 1. Install calibre 2. Open System Settings>Workspace Theme>Look and Feel 3. Open 'Get New Looks'. 4. Click on any of the heading links of the themes. OBSERVED RESULT Opens calibre's ebook editor which gives an error message popup: ERROR: Unsupported format "Tweaking is only supported for books in the AZW3 and EPUB formats. Convert your book to one of these formats first." EXPECTED RESULT I actually don't know what should happen here. This is my first KDE install. SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: Kubuntu 18.04 (available in About System) KDE Plasma Version: 5.12.7 KDE Frameworks Version: 5.44.0 Qt Version: 5.9.5 ADDITIONAL INFORMATION calibre version 3.21 from Kubuntu repos.
I can't reproduce this behavior on Arch Linux with calibre 3.45.0 and Plasma 5.16.3.
Me neither, with those same versions. I may have some idea of what's going on though. Please run the following commands in a terminal window: xdg-open https://store.kde.org/p/1167640 kioclient5 exec https://store.kde.org/p/1167640 Does either of those commands open Calibre instead of your web browser? Also, try going to System Settings > Applications > Default Applications > Web Browser and make sure links are set up to open "In the following application" and then select your web browser. Does that fix it?
After delving into the settings, I found that somehow calibre's ebook reader had been set as the default application for viewing HTML files causing the problem. This may be a bug on calibre's side. In any case, it's not a kde bug.
Yep, I had a feeling Calibre was doing something odd. FWIW it seems like newer versions of Calibre than what's provided by Ubuntu 18.04 don't suffer from the issue.