Dear Maintainer,
It doesn't install because it depends on qtdeclarative-abi-5-15-17:
root@yamagata:~# apt install linphone-desktop Solving dependencies... Error! Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming.
The following information may help to resolve the situation:
Unsatisfied dependencies:
linphone-desktop : Depends: linphone-common (>= 5.2.99~) but it is not going to be installed Depends: qml-module-qt-labs-platform but it is not going to be installed Depends: qml-module-qtgraphicaleffects but it is not going to be installed
Depends: qml-module-qtquick-controls but it is not going to be installed Depends: qml-module-qtquick-controls2 but it is not going to be installed Depends: qml-module-qtquick-dialogs but it is not going to be installed
Depends: qml-module-qtquick-layouts but it is not going to be installed Depends: qml-module-qtquick-shapes but it is not going to be installed Depends: qml-module-qtquick-window2 but it is not going to be installed
Depends: qml-module-qtquick2 but it is not going to be installed
Depends: libbctoolbox2 (>= 5.3.104) but it is not going to be installed Depends: libbctoolbox2 (< 5.4.0) but it is not going to be installed Depends: libbelcard1 (>= 5.3.105) but it is not going to be installed
Depends: liblinphone++12 (>= 5.3.0) but it is not going to be installed
Depends: liblinphone++12 (< 5.4.0) but it is not going to be installed Depends: liblinphone12 (>= 5.3.0) but it is not going to be installed Depends: liblinphone12 (< 5.4.0) but it is not going to be installed
Depends: libmediastreamer2-14 (>= 1:5.3.105) but it is not going to be installed
Depends: libmediastreamer2-14 (< 1:5.4.0) but it is not going to be installed Depends: libqt5multimedia5 (>= 5.15.1) but it is not going to be installed Depends: libqt5quickcontrols2-5 (>= 5.7.1) but it is not going to be installed
Depends: libqt5texttospeech5 (>= 5.8.0~alpha) but it is not going to be installed
Depends: qtdeclarative-abi-5-15-17 but it is not installable Recommends: qt5-gtk2-platformtheme but it is not installable Error: Unable to satisfy dependencies. Reached two conflicting assignments:
1. linphone-desktop:amd64=5.2.6+dfsg-1+b2 is selected for install 2. linphone-desktop:amd64 Depends qtdeclarative-abi-5-15-17 but none of the choices are installable:
[no choices]
libqt5qml5 provides qtdeclarative-abi-5-15-19, so I suppose that linphone needs to be rebuilt.