thank you very much....

ty, I have downgraded some packages (libglapi-mesa f.e.) and reinstalled some others. nopw everything is fine!

Thanks @p3c0 Based on the documentation, QtDeclarative has already been deprecated in favor of the two new classes: Qt Quick and Qt QML. QQuickPaintedItem can be use as convenient way to port QDeclarativeItem-based classes that use the QPainter API. I've been searching on the internet how to render text on QSG nodes but to no avail. I'm still stuck into this problem. :(