I don't know why standard login to mysql fails:
mysql -u davide -p Enter password: "my password" ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)
I can log in with this command:
mysql -h 127.0.0.1 -u davide -p
I can't login via phpMyadmin too for this reason