qt.qpa.plugin: Could not load the Qt platform plugin “xcb” in “” even though it was found.
For the Qt 6.5.0 release, the missing library was libxcb-cursor.so.0, resolved with sudo apt install libxcb-cursor0 With that, the sample widget and gui projects from QtCreator run correctly built with Qt 6.5.0. libxcb-cursor.so.0 wasn’t previously needed for Qt 6.4.0. I identified the missing library with this shell code for l in /path/to/Qt/6.5.0/gcc_64/lib/*.so; do echo $l; … Read more