Modem USB Multitech: conexão discada não funciona

[ecmotta]

O Ubuntu encontrou o modem, discou, mas desconectou e não foi possível navegar. Tentei várias vezes e não consegui. No registro do Gnome-PPP encontrei o seguinte:

--> Ignoring malformed input line: ";Do NOT edit this file by hand!"
--> WvDial: Internet dialer version 1.55
--> Cannot get information for serial port.
--> Initializing modem.
--> Sending: ATZ
ATZ
OK
--> Sending: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
OK
--> Modem initialized.
--> Sending: ATM1L3DT15002500
--> Waiting for carrier.
ATM1L3DT15002500
CONNECT 26400 V42bis
--> Carrier detected.  Waiting for prompt.
~[7f]}#@!}!Y} }8}"}&} }*} } }#}$@#}%}&@s*n}'}"}(}"Cf~
--> PPP negotiation detected.
--> Starting pppd at Sun Dec  3 20:35:55 2006
--> 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: 5116
--> Using interface ppp0
--> Disconnecting at Sun Dec  3 20:35:57 2006
--> 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)


Em tempo: No BigLinux, rodando a partir do CD, a conexão funcionou sem erros. Alguém pode me ajudar?