I assume you followed Install & Upgrade - Anki Manual and the forum entry you couldn’t link to was Issues running on Ubuntu 24.04?
On my debian I have a lot of other python3 files that seem relevant, maybe try installing them on ubuntu:
python3-pyqt6
python3-pyqt6.qtmultimedia
python3-pyqt6.qtqml
python3-pyqt6.qtquick
python3-pyqt6.qtsvg
python3-pyqt6.qttexttospeech
python3-pyqt6.qtwebchannel
python3-pyqt6.qtwebengine
python3-pyqt6.sip