qgis installation unmet dependencies error

The following packages have unmet dependencies:
 python3-qgis : Depends: python3-qgis-common (= 1:3.8.0+28bionic) but it is not going to be installed
                Depends: qgis-providers (= 1:3.8.0+28bionic) but it is not going to be installed
                Depends: libqgispython3.8.0 but it is not going to be installed
                Depends: libqgis-3d3.8.0 but it is not going to be installed
                Depends: libqgis-analysis3.8.0 but it is not going to be installed
                Depends: libqgis-core3.8.0 but it is not going to be installed
                Depends: libqgis-gui3.8.0 but it is not going to be installed
                Depends: libqgis-server3.8.0 but it is not going to be installed
 qgis : Depends: gdal-abi-2-2-3
        Depends: libqgis-analysis3.8.0 but it is not going to be installed
        Depends: libqgis-app3.8.0 but it is not going to be installed
        Depends: libqgis-core3.8.0 but it is not going to be installed
        Depends: libqgis-gui3.8.0 but it is not going to be installed
        Depends: qgis-providers (= 1:3.8.0+28bionic) but it is not going to be installed
 qgis-plugin-grass : Depends: qgis-provider-grass (= 1:3.8.0+28bionic) but it is not going to be installed
                     Depends: grass740
                     Depends: libqgis-app3.8.0 but it is not going to be installed
                     Depends: libqgis-core3.8.0 but it is not going to be installed
                     Depends: libqgis-gui3.8.0 but it is not going to be installed
                     Depends: libqgisgrass7-3.8.0 but it is not going to be installed
E: Unable to correct problems, you have held broken packages.