black boxes instead of buttons about gcompris-qt HOT 9 CLOSED

Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name                 Version      Architecture Description
+++-====================-============-============-=================================
ii  libqt5svg5:amd64     5.15.2-3     amd64        Qt 5 SVG module
ii  libqt5svg5-dev:amd64 5.15.2-3     amd64        Qt 5 SVG module development files

ii  libqt5multimedia5-plugins:amd64     5.15.2-3      amd64        Qt 5 Multimedia module plugins
ii  libqt5sensors5-dev:amd64            5.15.2-2      amd64        Qt 5 Sensors development files
ii  libqt5svg5-dev:amd64                5.15.2-3      amd64        Qt 5 SVG module development files
ii  libqt5xmlpatterns5-dev:amd64        5.15.2-3      amd64        Qt 5 XML patterns development files
ii  qml-module-qtmultimedia:amd64       5.15.2-3      amd64        Qt 5 Multimedia QML module
ii  qml-module-qtquick-controls:amd64   5.15.2-2      amd64        Qt 5 Quick Controls QML module
ii  qml-module-qtquick-particles2:amd64 5.15.2+dfsg-5 amd64        Qt 5 particles 2 QML module
ii  qtdeclarative5-dev:amd64            5.15.2+dfsg-5 amd64        Qt 5 declarative development files
ii  qtmultimedia5-dev:amd64             5.15.2-3      amd64        APIs for multimedia functionality - development files
ii  qttools5-dev-tools                  5.15.2-5      amd64        Qt 5 development tools

Package qt5-default is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

exeCount set to:  1
qml: enter main.qml (run #1, ratio=2.769230769230769, fontRatio=2.25, dpi=118, userDataPath=/home/tamas/.local/share/GCompris)
lastVersionRan set to:  10000
qrc:/gcompris/src/activities/menu/Menu.qml:105:5: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }
qrc:/gcompris/src/core/Bar.qml:326:5: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }
qrc:/gcompris/src/core/Bar.qml:279:5: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }
qrc:/gcompris/src/activities/menu/Menu.qml:705:13: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }
QSGTextureAtlas: texture atlas allocation failed, code=501
Successfully registered resource "/home/tamas/.cache/KDE/gcompris-qt/data2/voices-ogg/voices-en_US.rcc"
Downloading resource file "data2/backgroundMusic/backgroundMusic-ogg.rcc"
Successfully registered resource "/home/tamas/.cache/KDE/gcompris-qt/data2/backgroundMusic/backgroundMusic-ogg.rcc"
Local resource is up-to-date: "backgroundMusic-ogg.rcc"