If Akonadi fails to start, Kontact greys out the window and displays the error message, "The Akonadi personal information management service is not operational". Below this message is a "Details…" button. Clicking on the button has no effect. The button should instead launch a dialog window that displays details on why Akonadi cannot start (perhaps similar or identical to the output of running "akonadictl start" on the command line).
*** Bug 394768 has been marked as a duplicate of this bug. ***
Can still reproduce with 17.12.3 of Debian Testing.
Can still reproduce in Fedora 42: recently I broke Akonadi by removing mariadb and the "Details" button nor the "FAQ" link in the message worked. I found the same problem in Kmail and Merkuro Calendar. Operating System: Fedora Linux 42 KDE Plasma Version: 6.4.3 KDE Frameworks Version: 6.16.0 Qt Version: 6.9.1 Kernel Version: 6.15.8-200.fc42.x86_64 (64-bit) Graphics Platform: Wayland Processors: 4 × Intel® Core™ i5-2400 CPU @ 3.10GHz Memory: 16 GiB of RAM (15.4 GiB usable) Graphics Processor: llvmpipe Manufacturer: LENOVO Product Name: 7052A9G System Version: ThinkCentre M91p