ADSL上网配置的问题?PAP authentication failed

[新人123]

ADSL上网配置的问题?PAP authentication failed
dusk@dusk-desktop:~$ sudo plog
Nov 8 12:08:27 dusk-desktop pppd[5735]: PPP session is 247
Nov 8 12:08:27 dusk-desktop pppd[5735]: Using interface ppp0
Nov 8 12:08:27 dusk-desktop pppd[5735]: Connect: ppp0 <--> eth0
Nov 8 12:08:27 dusk-desktop pppd[5735]: PAP authentication failed
Nov 8 12:08:27 dusk-desktop pppd[5735]: Connection terminated.
Nov 8 12:08:57 dusk-desktop pppd[5735]: PPP session is 255
Nov 8 12:08:57 dusk-desktop pppd[5735]: Using interface ppp0
Nov 8 12:08:57 dusk-desktop pppd[5735]: Connect: ppp0 <--> eth0
Nov 8 12:09:00 dusk-desktop pppd[5735]: PAP authentication failed
Nov 8 12:09:00 dusk-desktop pppd[5735]: Connection terminated.
dusk@dusk-desktop:~$

[鹭鸶与仙鹤]

我是刚刚接触ubuntu。

按照wiki及论坛的前辈的讲解，用sudo pppoeconf 来设置，输入username , password 后，也遇到同样的问题。
一直搞不明白。。。。
WINDOWS下是可以上网的。
是不是驱动没装好？还是其它的什么原因？

还有，ubuntu下联网成功后，系统里是不是也象WINDOWS那样，有个小的计算机在闪烁那样类似的图标，表示联网状态呢？