Created attachment 146903 [details] values of the drop down list SUMMARY *** If "Google Chrome" is selected as default application for Email client, the system fails whenever a user click on a "mailto" link. *** STEPS TO REPRODUCE 1. Set "Google Chrome" (from the pre-populated drop down list - see attached screenshot) as the default "Email Client" in the System Settings/Applications/DefaultApplications 2. Open Konsole 3. Clink on Help/About Konsole 4. Click on Authors 5. Click on mail icon (tooltip is: Email contributor) OBSERVED RESULT Error message popup: " Unable to create io-slave. Unknown protocol 'mailto' ". EXPECTED RESULT Chrome is started with mailto "function" and user is able to edit the email. SOFTWARE/OS VERSIONS Linux/KDE Plasma: Kubuntu 21.10 / 5.22.5 (available in About System) KDE Plasma Version: 5.22.5 KDE Frameworks Version: 5.86.0 Qt Version: 5.15.2 ADDITIONAL INFORMATION If the "Email client" is set to "google-chrome" shell script (located in the /opt/google/chrome/ directory), than the function is working, chrome is started and user is able to edit the email.
Created attachment 146904 [details] error message
The error message is related to https://bugs.kde.org/show_bug.cgi?id=440062 Why it offers google chrome in the first place is a mystery, it doesn't do that there. Are you using Gmail in the browser?
After fresh install of Kubuntu I did not check the content of the dropdown list, but Chrome was not installed at that time. So I installed it from deb package. I think this was the moment when the dropdown list was extended with the "Google Chrome" value, but I did not checked at that time. Later (today), I just started to play with the settings and I found this option. Yes, I am using Gmail in the browser.
When opening Gmail it offered me to install a service handler for mailto links, which added the entry to the settings. That is actually a good feature, it would be even better if it called itsefl Gmail instead of Google Chrome. In any case, Plasma is behaving as expected as far as I can tell and the error you see is https://bugs.kde.org/show_bug.cgi?id=440062 *** This bug has been marked as a duplicate of bug 440062 ***