problème pendant la mise à jour

[Pierrick PONS <ppons@cvf.fr>]

Bonjour,
J'ai voulu mettre à jour mes paquets et j'ai fait apt-get update et apt-get 
upgrade.
Dès que l'upgrade commence une fenêtre sous fond bleue s'affiche en me disant:


lqqqqqqqqqqqqqqqqqqqqqqq Debian System Configuration qqqqqqqqqqqqqqqqqqqqqqqk
x Empty password was entered.                                               x
x                                                                           x
x You seem to have entered nothing for the password. That is not secure!    x
x Please try again.                                                         x
x                                                                           x
x                                                                           x
tqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqu
x                                 <  OK  >



Puis :


 Debian System Configuration 
     A good password will contain a mixture of letters, numbers and    
     punctuation and will be changed at regular intervals.             
                                                                       
     Enter a password for the new user:                                
    

                          <  OK  >      <Cancel>


Mais peu importe ce que je tape, le prog n'en tient pas compte et ça me redit 
toujours la même chose en boucle.
Je ne sais vraiment pas comment faire pour mettre au propre mon installation .

D'avance merci pour toute aide.

Pierrick