- 
    Bug 
- 
    Resolution: Fixed
- 
    P3: Somewhat important 
- 
    6.6.3
- 
    None
- 
    Ubuntu 24
Since Ubuntu 23, a Qt app's main window looks weird: it has no border and has no shadow.  
 
I've managed to "get" the border and the shadow by setting QT_QPA_PLATFORM environment variable to "xcb".
 
The same issue is described here: https://ubuntuhandbook.org/index.php/2023/10/window-border-shadow-qt-apps-ubuntu/.