I do not understand exactly why but I seem to have solved the problem running the following commands from terminal as root user (after havint done what said in #4 yesterday):
apt-get update
apt-get upgrade
apt-get dist-upgrade
apt-get autoclean
apt-get autoremove
I do not understand exactly why but I seem to have solved the problem running the following commands from terminal as root user (after havint done what said in #4 yesterday):
apt-get update
apt-get upgrade
apt-get dist-upgrade
apt-get autoclean
apt-get autoremove