[Qgis-user] Need help with problems with Python console with QGIS built from source on Kubuntu 25.10

[Michael Rans]

 I solved the Qt6 error No module named 'PyQt5 by cleaning the previous install of qgis including deleting /usr/local/share/qgis then reinstalling. Unfortunately I then got an error very similar to the one I got when building using Qt5: qgis._gui cannot import type '����v' from PyQt6.QtCoreI have added that under the first ticket I made and closed the second. Any help on this would be appreciated.
    On Sunday, 9 November 2025 at 13:08:53 GMT+13, Michael Rans <mcarans at yahoo.co.uk> wrote:  
 
 I want to build QGIS from source so it uses the latest GDAL which I've built from source.
I have been able to get QGIS to build on Kubuntu 25.10. The problems I have run into are on startup with the Python console. 
Building with Qt5, I get "qgis._gui cannot import type '����' from PyQt5.QtCore". One possibility is that the build is using the wrong sip version as it seems to find sip-build. My understanding is that sip-build is for Qt6 while sip is for Qt5, but even setting the cmake flag in the cmake UI to use sip instead of sip-build, it seems to keep using sip-build regardless. More here: https://github.com/qgis/QGIS/issues/63834
Building with Qt6 by setting the appropriate flag in the cmake UI, I get a QGIS Qt6 build startup failure in qgsfeature "No module named 'PyQt5'"  I don't know why it is trying to use Qt5 in a Qt6 build. More here: https://github.com/qgis/QGIS/issues/63847
Please can anyone help.  
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