If you come by plane, usually you fly into Aéroport Paris – Charles de Gaulle, the largest airport in France, close to Paris. There is the RER B train from Charles de Gaulle airport that goes straight to Saint-Michel Notre-Dame station, then you must take the Métro line 10 to Jussieu.
The trip from Paris-Charles de Gaulle to UPMC takes about 1 hours.