Vnstat under xubuntu
To install vnstat for ppp0 :
darek@home:~/Pulpit$ sudo vnstat -u -i ppp0 [sudo] password for darek: Error: Unable to read database "/var/lib/vnstat/ppp0". Info: -> A new database has been created. darek@home:~/Pulpit$

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Vnstat under xubuntu
To install vnstat for ppp0 :
darek@home:~/Pulpit$ sudo vnstat -u -i ppp0 [sudo] password for darek: Error: Unable to read database "/var/lib/vnstat/ppp0". Info: -> A new database has been created. darek@home:~/Pulpit$
Vnstat...
Créer une base de données pour par exemple lire les données de ppp0:
compte@compte:~/Pulpit$ sudo vnstat -u -i ppp0 [sudo] password for compte: Error: Unable to read database "/var/lib/vnstat/ppp0". Info: -> A new database has been created.
A partir de ce moment si vous choisissez de lire ppp0, c'est possible :)