I tried to install a software which depends on python3-pyside2.qtcore, but this package (and some other pyside2 packages) cannot be installed in KDE Neon 5.20.3.

Here is the full output.

Code: Select all

$ sudo apt install python3-pyside2.qtcore
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Starting pkgProblemResolver with broken count: 1
Starting 2 pkgProblemResolver with broken count: 1
Investigating (0) python3-pyside2.qtcore:amd64 < none -> 5.14.0-1~exp1ubuntu5 @un puN Ib >
Broken python3-pyside2.qtcore:amd64 Depends on libpyside2-py3-5.14:amd64 < none | 5.14.0-1~exp1ubuntu5 @un uH > (>= 5.14.0)
  Considering libpyside2-py3-5.14:amd64 0 as a solution to python3-pyside2.qtcore:amd64 9999
    Reinst Failed early because of qtbase-abi-5-12-8:amd64
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:
 python3-pyside2.qtcore : Depends: libpyside2-py3-5.14 (>= 5.14.0) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.


When I try to install libpyside2-py3-5.14 I get the following output.

Code: Select all

$ sudo apt install libpyside2-py3-5.14
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Starting pkgProblemResolver with broken count: 1
Starting 2 pkgProblemResolver with broken count: 1
Investigating (0) libpyside2-py3-5.14:amd64 < none -> 5.14.0-1~exp1ubuntu5 @un puN Ib >
Broken libpyside2-py3-5.14:amd64 Depends on libshiboken2-py3-5.14:amd64 < none | 5.14.0-1~exp1ubuntu5 @un uH > (>= 5.14.0)
  Considering libshiboken2-py3-5.14:amd64 0 as a solution to libpyside2-py3-5.14:amd64 9999
  Re-Instated libshiboken2-py3-5.14:amd64
Broken libpyside2-py3-5.14:amd64 Depends on qtbase-abi-5-12-8:amd64 < none @un H >
  Considering libqt5core5a:amd64 3521 as a solution to libpyside2-py3-5.14:amd64 9999
Broken libpyside2-py3-5.14:amd64 Depends on qtdeclarative-abi-5-12-8:amd64 < none @un H >
  Considering libqt5qml5:amd64 736 as a solution to libpyside2-py3-5.14:amd64 9999
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:
 libpyside2-py3-5.14 : Depends: qtbase-abi-5-12-8
                       Depends: qtdeclarative-abi-5-12-8
E: Unable to correct problems, you have held broken packages.


Both these packages are available in Ubuntu 20.04 (according to http://packages.ubuntu.com), so I was wondering what went wrong.

I know that I can install PySide from pip, but it has does not follow system themes (https://stackoverflow.com/q/52426437/3128341). That is why I want to install the apt version.