This fix is surely dirty, but it worked for me
I managed to resolve my problem;
The problem was libpulse0 which has been upgraded to the version 7.5 while the required version was the 7.4.
I've reinstalled the 7.4 version:
sudo apt install libpulse0=1:11.1-1ubuntu7.4
sudo apt-mark hold libpulse0
(apt-mark hold is used to prevent the upgrade of ...