I have the same errors using the ubuntu repositories:
repository https://qgis.org/ubuntu :
pigreco@lenovo:~$ sudo apt-get install qgis qgis-plugin-grass
Reading package lists... Done
Building dependency tree
Reading state information... Done
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:
The following packages have unmet dependencies:
qgis : Depends: libqgis-3d3.14.0 but it is not going to be installed
Depends: libqgis-analysis3.14.0 but it is not going to be installed
Depends: libqgis-app3.14.0 but it is not going to be installed
Depends: libqgis-core3.14.0 but it is not going to be installed
Depends: libqgis-gui3.14.0 but it is not going to be installed
Depends: python3-qgis (= 1:3.14.0+28bionic) but
1:3.15.0+git20200708+a49cb7c9f3+28bionic-ubuntugis is to be installed
Depends: qgis-providers (= 1:3.14.0+28bionic) but
1:3.15.0+git20200708+a49cb7c9f3+28bionic-ubuntugis is to be installed
qgis-plugin-grass : Depends: qgis-provider-grass (= 1:3.14.0+28bionic) but
it is not going to be installed
Depends: grass740
Depends: libgdal20 (>= 1.8.0) but it is not going to be
installed
Depends: libqgis-app3.14.0 but it is not going to be
installed
Depends: libqgis-core3.14.0 but it is not going to be
installed
Depends: libqgis-gui3.14.0 but it is not going to be
installed
Depends: libqgisgrass7-3.14.0 but it is not going to be
installed
E: Unable to correct problems, you have held broken packages.
--
Instead it works fine on OSGeo4W shell
ciao compare.
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