Mmm, yes I should have sent this one too: sudo apt-get install python3 git bison ninja-build build-essential ca-certificates ccache cmake cmake-curses-gui dh-python doxygen expect flex flip gdal-bin grass-dev libexiv2-dev libexpat1-dev libfcgi-dev libgdal-dev libgeos-dev libgsl-dev libpq-dev libproj-dev libzip-dev libprotobuf-dev libspatialindex-dev libdraco-dev python3-dev python3-pyqt6.sip libxkbcommon-dev protobuf-compiler sip-tools spawn-fcgi xauth xfonts-100dpi xfonts-75dpi xfonts-base xfonts-scalable xvfb python3-pyqtbuild libqca-qt6-dev qtkeychain-qt6-dev libqscintilla2-qt6-dev qt6-serialport-dev qt6-svg-dev qt6-positioning-dev libqt6core5compat6 qt6-5compat-dev python3-pyqt6 python3-pyqt6.qsci pyqt6-dev-tools python3-pyqt6.qtmultimedia qml6-module-qtmultimedia qt6-multimedia-dev qt6-tools-dev pyqt6-dev pyqt6.qsci-dev python3-pyqt6.qtpositioning python3-pyqt6.qtserialport python3-pyqt6.qtsvg
As you can see I install the multimedia stuff already, so that is probably the reason it 'just worked'(TM) with me :-) Glad this is fixed! Regards, Richard Duivenvoorde On 22-07-2025 09:00, Alessandro Pasotti wrote:
Thank you Richard, your workflow is almost exactly the same I am doing. With the help of Nyall I have been able to track down the issue to a missing packagepython3-pyqt6.qtmultimedia. The debugging process involved removing all the imports from https://github.com/qgis/QGIS/blob/master/python/PyQt6/gui/gui.sip.in <https://github.com/qgis/QGIS/blob/master/python/PyQt6/gui/gui.sip.in> and find the broken piece, to my surprise, removing the lines highlighted here https://github.com/qgis/QGIS/blob/master/python/PyQt6/gui/gui.sip.in#L16C1-L20C22 <https://github.com/qgis/QGIS/blob/master/python/PyQt6/gui/gui.sip.in#L16C1-L20C22> eventually led to a readable error message (QtMultimedia could not be imported) instead of the corrupted one. Why the error message gets corrupted after qsci is imported (or after https://github.com/qgis/QGIS/blob/master/python/PyQt6/gui/gui_auto.sip <https://github.com/qgis/QGIS/blob/master/python/PyQt6/gui/gui_auto.sip> is imports, I don't know which one is responsible of the issue) still remains a mystery to me. Thank you all for the help! On Mon, Jul 21, 2025 at 8:23 PM Richard Duivenvoorde <rdmaili...@duif.net <mailto:rdmaili...@duif.net>> wrote: I'm on Trixie (next stable in a couple of weeks), and only build QWT myself from source: # https://qwt.sourceforge.io/qwtinstall.html <https://qwt.sourceforge.io/qwtinstall.html> # download the tar.bz2 from https://sourceforge.net/projects/qwt/files/qwt/6.3.0/ <https://sourceforge.net/projects/qwt/files/qwt/6.3.0/> # unpack and go into ~/git/qwt-6.3.0 dir # error: qmake: could not find a Qt installation of '' -> https://askubuntu.com/questions/1460242/ubuntu-22-04-with-qt6-qmake-could-not-find-a-qt-installation-of <https://askubuntu.com/questions/1460242/ubuntu-22-04-with-qt6-qmake-could-not-find-a-qt-installation-of>? qtchooser -install qt6 $(which qmake6) export QT_SELECT=qt6 # create Makefile /usr/bin/qmake qwt.pro <http://qwt.pro> # compile make # install (in /usr/local/qwt-6.3.0 ) sudo make install Then, leaving out a lot of stuff...: mkdir buildqt6;cd buildqt6;ccmake -GNinja -DBUILD_TESTING=FALSE -DENABLE_TESTS=OFF -DWITH_SERVER=FALSE -DWITH_3D=FALSE -DCMAKE_INSTALL_PREFIX=/home/richard/bin/qgis_/qt6/debug -DWITH_QWTPOLAR=OFF -DCMAKE_BUILD_TYPE=Debug -DWITH_GRASS=FALSE -DBUILD_WITH_QT6=TRUE -DWITH_OAUTH2_PLUGIN=FALSE -DWITH_WITH_SERVER_PLUGINS=OFF -DWITH_STAGED_PLUGINS=OFF -DWITH_PDAL=OFF -DWITH_QTWEBKIT=OFF -DQWT_INCLUDE_DIR=/usr/local/qwt-6.3.0/include -DQWT_LIBRARY=/usr/local/qwt-6.3.0/lib/libqwt.so .. in the same git repo as my qt5 build, QGIS works. I'm on python 3.13.5 here Not sure if this helps... Richard On 21-07-2025 17:52, Alessandro Pasotti via QGIS-Developer wrote: > > Thanks, I'm using Python 3.13 (that comes with that Ubuntu version). > > Now I'm trying with vcpkg ... > > > On Mon, Jul 21, 2025 at 5:35 PM pathmapper <pathmap...@posteo.de <mailto:pathmap...@posteo.de> <mailto:pathmap...@posteo.de <mailto:pathmap...@posteo.de>>> wrote: > > Hi, > > I don't know what's wrong, but when I had similar problems, switching to > Python 3.12 solved them for me. > > Cheers, > Björn > > On 21.07.2025 16:58, Alessandro Pasotti via QGIS-Developer wrote: > > Hi, > > > > I am trying to build QGIS with QT6 on Ubuntu (tried 24.10 and 25.04), > > it builds without errors but when I run it, the following error > > appears: > > > > Couldn't load PyQGIS. > > Python support will be disabled. > > > > Traceback (most recent call last): > > File "", line 1, in > > File > > "/home/ale/dev/QGIS/build/Desktop_QT6-Debug/output/python/qgis/gui/__init__.py", > > line 25, in > > from qgis._gui import * > > RuntimeError: qgis._gui cannot import type '���A� ' from > > PyQt6.QtCore > > > > Python version: > > 3.13.3 (main, Jun 16 2025, 18:15:32) [GCC 14.2.0] > > > > QGIS version: > > 3.99.0-Master 'Master', e717e3cd2b9 > > > > Python path: > > ['/home/ale/dev/QGIS/build/Desktop_QT6-Debug/output/python', > > '/home/ale/.local/share/QGIS/QGIS3/profiles/default/python', > > '/home/ale/.local/share/QGIS/QGIS3/profiles/default/python/plugins', > > '/home/ale/dev/QGIS/build/Desktop_QT6-Debug/output/python/plugins', > > '/home/ale/dev/gdal/desktop-install/local/lib/python3.13/dist-packages', > > '/home/ale/dev/gdal/autotest/pymod', '/usr/lib/python313.zip', > > '/usr/lib/python3.13', '/usr/lib/python3.13/lib-dynload', > > '/usr/local/lib/python3.13/dist-packages', > > '/usr/lib/python3/dist-packages'] > > > > I checked the QGIS/build/Desktop_QT6-Debug/output/python/qgis content > > and it looks legit. > > > > PyQt6 installation also looks ok, importing core works ok, only gui > > does not work. > > > > Any idea about what's going wrong? > > > > -- > > > > Alessandro Pasotti > > QCooperative: www.qcooperative.net <http://www.qcooperative.net> <http://www.qcooperative.net <http://www.qcooperative.net>> [1] > > ItOpen: www.itopen.it <http://www.itopen.it> <http://www.itopen.it <http://www.itopen.it>> [2] > > > > Links: > > ------ > > [1] https://www.qcooperative.net <https://www.qcooperative.net> <https://www.qcooperative.net <https://www.qcooperative.net>> > > [2] http://www.itopen.it <http://www.itopen.it> <http://www.itopen.it <http://www.itopen.it>> > > > > _______________________________________________ > > QGIS-Developer mailing list > > QGIS-Developer@lists.osgeo.org <mailto:QGIS-Developer@lists.osgeo.org> <mailto:QGIS-Developer@lists.osgeo.org <mailto:QGIS-Developer@lists.osgeo.org>> > > List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer <https://lists.osgeo.org/mailman/listinfo/qgis-developer> <https://lists.osgeo.org/mailman/listinfo/qgis-developer <https://lists.osgeo.org/mailman/listinfo/qgis-developer>> > > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer <https://lists.osgeo.org/mailman/listinfo/qgis-developer> <https://lists.osgeo.org/mailman/listinfo/qgis-developer <https://lists.osgeo.org/mailman/listinfo/qgis-developer>> > > > > -- > Alessandro Pasotti > QCooperative: www.qcooperative.net <http://www.qcooperative.net> <https://www.qcooperative.net <https://www.qcooperative.net>> > ItOpen: www.itopen.it <http://www.itopen.it> <http://www.itopen.it <http://www.itopen.it>> > > _______________________________________________ > QGIS-Developer mailing list > QGIS-Developer@lists.osgeo.org <mailto:QGIS-Developer@lists.osgeo.org> > List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer <https://lists.osgeo.org/mailman/listinfo/qgis-developer> > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer <https://lists.osgeo.org/mailman/listinfo/qgis-developer> -- Alessandro Pasotti QCooperative: www.qcooperative.net <https://www.qcooperative.net> ItOpen: www.itopen.it <http://www.itopen.it>
_______________________________________________ QGIS-Developer mailing list QGIS-Developer@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
