QgroundControl not show UI

Hi from some days, after QT update (QT 5.15) the QgroundControl not show the UI. When i try to launch I get this errors

qrc:/qml/MainRootWindow.qml:25:1: Type ApplicationWindow unavailable
file:///usr/lib/qt/qml/QtQuick/Controls.2/qmldir: plugin cannot be loaded for module "QtQuick.Controls": Cannot install type 'VerticalHeaderView' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'HorizontalHeaderView' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install element 'SplitHandle' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'SplitView' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install element 'Overlay' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'MenuBarItem' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'MenuBar' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'ActionGroup' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'Action' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'ScrollView' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'DelayButton' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'ToolSeparator' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'RoundButton' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'MenuSeparator' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'DialogButtonBox' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'Dialog' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'Tumbler' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'ToolTip' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'ToolButton' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'ToolBar' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'TextField' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'TextArea' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'TabButton' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'TabBar' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'SwitchDelegate' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'Switch' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'SwipeView' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'SwipeDelegate' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'StackView' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'SpinBox' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'Slider' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'ScrollIndicator' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'ScrollBar' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'RangeSlider' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'RadioDelegate' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'RadioButton' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'ProgressBar' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'Popup' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'Pane' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'PageIndicator' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'Page' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'MenuItem' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'Menu' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'Label' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'ItemDelegate' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'GroupBox' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'Frame' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'Drawer' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'Dial' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'Control' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'Container' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'ComboBox' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'CheckDelegate' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'CheckBox' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'ButtonGroup' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'Button' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'BusyIndicator' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'ApplicationWindow' into protected module 'QtQuick.Controls' version '2'
<Unknown File>: Cannot install type 'AbstractButton' into protected module 'QtQuick.Controls' version '2'
qt.positioning.geoclue2: Unable to obtain the client patch: "org.freedesktop.DBus.Error.ServiceUnknownThe name org.freedesktop.GeoClue2 was not provided by any .service files"

I’m not sure if is a qgroundcontrol problems or qt but other qt applications work without problems

Are you using a version of Qt you built yourself or downloaded from the QGC web site? What version are you using and how are you launching QGC?

The Qt(Qt 5.15.0) has been downloaded from my distro repo. I downloaded QGC from the github repository and tried to build the master and qt_5_15 but in both cases I had the same problem. The steps I performed for the build are the following:

after git clone in build-dir
qmake …/qgroundcontrol.pro -spec linux-g++ CONFIG+=qtquickcompiler
make -j4
./release/qgroundcontrol-start.sh

Before the Qt update everything worked perfectly.

As stated in the dev guide: * Qt version: 5.12.6 (only)