Failure in converting PyQt5 to PyQt6

[ullix]

A have a larger Python program, based on PyQt5, and running well on 
Linux, Win, Mac. I tried to convert to PyQt6 and failed.

I changed all "PyQt5" to "PyQt6", and used the tool from K.Mulier 
(https://stackoverflow.com/a/72658216/6178507) to convert the enums, 
which - so far- seemed to have worked ok.

However, upon starting, the program crashes at the execution of:

gapp = QApplication([])

with the message:

qt.qpa.plugin: From 6.5.0, xcb-cursor0 or libxcb-cursor0 is needed to 
load the Qt xcb platform plugin.
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even 
though it was found.
This application failed to start because no Qt platform plugin could be 
initialized. Reinstalling the application may fix this problem.
Available platform plugins are: wayland-egl, linuxfb, wayland, vnc, 
vkkhrdisplay, minimal, eglfs, minimalegl, offscreen, xcb.

I had seen this obscure message a few years earlier with PyQt5. Back the 
it could be "fixed" by executing:
sudo apt-get install libxcb-xinerama0

Today with PyQt6 this does NOT help.

What now?Any guidance?

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