SUMMARY When I click on "Install modules" Discover opens with the error message "Unable to open "appstream://org.kde.kipi_plguins". STEPS TO REPRODUCE 1. Click on "Install modules" SOFTWARE/OS VERSIONS Linux/KDE Plasma: Kubuntu 20.04 (available in About System) KDE Plasma Version: 5.18.5 KDE Frameworks Version: 5.68.0 Qt Version: 5.12.8
Same in KDE Neon 5.19 with Plasma 5.19.1, it seems a typo. Until it gets fixed it's possible to search for Gwenview in Discover and KIPI Plugins will appear or opening appstream://org.kde.kipi_plugins from a web browser.
*** This bug has been marked as a duplicate of bug 421015 ***