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SUMMARY
Webcamoid (9.2.3-1) installed in Kubuntu 25.04 fails to launch.

STEPS TO REPRODUCE
1. Install webcamoid: sudo apt install webcamoid
2. Launch Webcamoid from Applications
3. Application Icon appears for a few seconds then disappears and app doesn't launch

OBSERVED RESULT
Application Icon appears briefly, but app fails to launch. Launching from the CLI shows this pertinent output before execution halts:

> [2025-08-27 11:51:00.419, Webcamoid, 0x78853f63bc80,  (0)] info: Plugin file pattern:  "lib*.so"
> [2025-08-27 11:51:00.420, Webcamoid, 0x78853f63bc80,  (0)] info: Search paths:
> [2025-08-27 11:51:00.420, Webcamoid, 0x78853f63bc80,  (0)] info:      "/usr/lib/x86_64-linux-gnu/qt/plugins/avkys"
> [2025-08-27 11:51:00.420, Webcamoid, 0x78853f63bc80,  (0)] info: Plugin links:
> [2025-08-27 11:51:00.420, Webcamoid, 0x78853f63bc80,  (0)] info:      "VideoSink/VirtualCamera/Impl/*" -> "VideoSink/VirtualCamera/Impl/v4l2loopback"
> [2025-08-27 11:51:00.535, Webcamoid, 0x78853f63bc80,  (0)] warning: QQmlApplicationEngine failed to load component
> [2025-08-27 11:51:00.535, Webcamoid, 0x78853f63bc80, main.qml (522)] warning: qrc:/Webcamoid/share/qml/main.qml:522:5: Type MainPanel unavailable
> [2025-08-27 11:51:00.536, Webcamoid, 0x78853f63bc80, MainPanel.qml (106)] warning: qrc:/Webcamoid/share/qml/MainPanel.qml:106:9: Type VideoOptions unavailable
> [2025-08-27 11:51:00.536, Webcamoid, 0x78853f63bc80, VideoOptions.qml (62)] warning: qrc:/Webcamoid/share/qml/VideoOptions.qml:62:9: Type VideoOutputs unavailable
> [2025-08-27 11:51:00.536, Webcamoid, 0x78853f63bc80, VideoOutputs.qml (24)] warning: qrc:/Webcamoid/share/qml/VideoOutputs.qml:24:1: module "Qt.labs.settings" is not installed
 

EXPECTED RESULT
Application should launch.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: 6.3.6
KDE Plasma Version: 6.3.6
KDE Frameworks Version: 6.14.0
Qt Version: 6.8.3

ADDITIONAL INFORMATION
Google search on:

Webcamoid warning: qrc:/Webcamoid/share/qml/VideoOutputs.qml:24:1: module "Qt.labs.settings" is not installed

finds this:

Debian Bug report logs #1089101 webcamoid: Webcamoid fails to run (https://bugs-devel.debian.org/cgi-bi...gi?bug=1089101)

In that report, the 'fix' is to:

apt install qml6-module-qt-labs-settings

I did this and the application now launches and runs as expected.