Created attachment 113104 [details] The error that appears when trying to open a file manager. After inserting a USB flash stick, Device Notifier displays a notification with the new device. When I select the USB stick and click "Open with File Manager", Dolphin doesn't start and instead an error dialog is displayed (see the attached screenshot). The error appears only after the first attempt to open the USB drive in the file manager. After that the drive appears to be mounted and attempting to open it the second time succeeds. It looks like the first time the file manager is started before the drive has been mounted. Kubuntu 18.04, Plasma 5.12.5, KDE Frameworks 5.44.0, Qt 5.9.5.
*** This bug has been marked as a duplicate of bug 370975 ***