LG LDU 800 sous ubuntu 9.04

Bonjour,
j'ai configurer mon modem LG LDU 800, comme ubuntu 8.04
lorsque je tape la commde wvdial au terminal je reçois comme message :

--> WvDial: Internet dialer version 1.60
--> Cannot get information for serial port.
--> Initializing modem.
--> Sending: ATZ
OK
--> Sending: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
OK
--> Modem initialized.
--> Sending: ATDT#777
--> Waiting for carrier.
ATDT#777
CONNECT
--> Carrier detected. Waiting for prompt.
~[7f]}#@!}!}!} }3}"}&} } } } }#}%B#}%}'}"}(}"W}0~
--> PPP negotiation detected.
--> Starting pppd at Tue May 5 10:42:16 2009
--> Warning: Could not modify /etc/ppp/pap-secrets: Permission denied
--> --> PAP (Password Authentication Protocol) may be flaky.
--> Warning: Could not modify /etc/ppp/chap-secrets: Permission denied
--> --> CHAP (Challenge Handshake) may be flaky.
--> Pid of pppd: 4777
--> Using interface ppp0
--> pppd: ��@[08][08]�@[08]
--> pppd: ��@[08][08]�@[08]
--> pppd: ��@[08][08]�@[08]
--> pppd: ��@[08][08]�@[08]
--> pppd: ��@[08][08]�@[08]
--> Disconnecting at Tue May 5 10:42:20 2009
--> The PPP daemon has died: Authentication error.
--> We failed to authenticate ourselves to the peer.
--> Maybe bad account or password? (exit code = 19)
--> man pppd explains pppd error codes in more detail.
--> I guess that's it for now, exiting
--> The PPP daemon has died. (exit code = 19)
--> WvDial: Internet dialer version 1.60
--> Cannot get information for serial port.
--> Initializing modem.
--> Sending: ATZ
OK
--> Sending: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
OK
--> Modem initialized.
--> Sending: ATDT#777
--> Waiting for carrier.
ATDT#777
CONNECT
--> Carrier detected. Waiting for prompt.
~[7f]}#@!}!}!} }3}"}&} } } } }#}%B#}%}'}"}(}"W}0~
--> PPP negotiation detected.
--> Starting pppd at Tue May 5 10:42:16 2009
--> Warning: Could not modify /etc/ppp/pap-secrets: Permission denied
--> --> PAP (Password Authentication Protocol) may be flaky.
--> Warning: Could not modify /etc/ppp/chap-secrets: Permission denied
--> --> CHAP (Challenge Handshake) may be flaky.
--> Pid of pppd: 4777
--> Using interface ppp0
--> pppd: ��@[08][08]�@[08]
--> pppd: ��@[08][08]�@[08]
--> pppd: ��@[08][08]�@[08]
--> pppd: ��@[08][08]�@[08]
--> pppd: ��@[08][08]�@[08]
--> Disconnecting at Tue May 5 10:42:20 2009
--> The PPP daemon has died: Authentication error.
--> We failed to authenticate ourselves to the peer.
--> Maybe bad account or password? (exit code = 19)
--> man pppd explains pppd error codes in more detail.
--> I guess that's it for now, exiting
--> The PPP daemon has died. (exit code = 19)
--> WvDial: Internet dialer version 1.60
--> Cannot get information for serial port.
--> Initializing modem.
--> Sending: ATZ
OK
--> Sending: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
OK
--> Modem initialized.
--> Sending: ATDT#777
--> Waiting for carrier.
ATDT#777
CONNECT
--> Carrier detected. Waiting for prompt.
~[7f]}#@!}!}!} }3}"}&} } } } }#}%B#}%}'}"}(}"W}0~
--> PPP negotiation detected.
--> Starting pppd at Tue May 5 10:42:16 2009
--> Warning: Could not modify /etc/ppp/pap-secrets: Permission denied
--> --> PAP (Password Authentication Protocol) may be flaky.
--> Warning: Could not modify /etc/ppp/chap-secrets: Permission denied
--> --> CHAP (Challenge Handshake) may be flaky.
--> Pid of pppd: 4777
--> Using interface ppp0
--> pppd: ��@[08][08]�@[08]
--> pppd: ��@[08][08]�@[08]
--> pppd: ��@[08][08]�@[08]
--> pppd: ��@[08][08]�@[08]
--> pppd: ��@[08][08]�@[08]
--> Disconnecting at Tue May 5 10:42:20 2009
--> The PPP daemon has died: Authentication error.
--> We failed to authenticate ourselves to the peer.
--> Maybe bad account or password? (exit code = 19)
--> man pppd explains pppd error codes in more detail.
--> I guess that's it for now, exiting
--> The PPP daemon has died. (exit code = 19)


comment naviguer sur le net avec mon modem LG LDU 800 sous ubuntu 9.04 ???

aidez moi SVP ...