For non Italian speakers, the article in the Corriere della Sera simply refers to a "problem with the pressurization system" but the best part is the observation that it was "impossible to use the oxygen masks". This was at 3000ft.
Even more bizarre is the comment from consumer advocate Carlo Rienzi who told media: "We want explanations not only about the causes that generated the smoke on board but above all about the impossibility to use the oxygen masks. Until this is clarified the entire fleet of the new company must be grounded until every aircraft is inspected".