SUMMARY Right-clicking on a file and then choosing Share > Send via Email... shows "Unable to create io-slave. Unknown protocol 'mailto'." STEPS TO REPRODUCE 1. Right-click on a file in Dolphin. Choose Share > Send via Email... 2. 3. OBSERVED RESULT A window titled "Error --- KIOExec" appears with "Unable to create io-slave. Unknown protocol 'mailto'." EXPECTED RESULT My preferred E-mail client should open (set to Firefox Web Browser) in System Settings > Applications > Default Applications > Email client SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: Kubuntu 21.04 with beta ppa installed (available in About System) KDE Plasma Version: 5.22.90 KDE Frameworks Version: 5.86.0 Qt Version: 5.15.12 ADDITIONAL INFORMATION Happens in both Wayland & X11
*** This bug has been marked as a duplicate of bug 440062 ***