:~$ sudo pppoeconf
Password:
Plugin rp-pppoe.so loaded.
:~$ plog
May 28 11:13:37 lee pppd[6287]: Plugin rp-pppoe.so loaded.
May 28 11:13:37 lee pppd[6289]: pppd 2.4.4 started by root, uid 0
May 28 11:13:37 lee pppd[6289]: PPP session is 7472
May 28 11:13:37 lee pppd[6289]: Using interface ppp0
May 28 11:13:37 lee pppd[6289]: Connect: ppp0 <--> eth0
May 28 11:13:38 lee pppd[6289]: Remote message: permission denied
May 28 11:13:38 lee pppd[6289]: PAP authentication failed
May 28 11:13:38 lee pppd[6289]: Connection terminated.
:~$

我是宽频用户．
ｕｂｕｎｔｕ　无论是安装在卓上电脑．或是虚拟器ｖｍ中．
上网到能连通．
如果有时不能上网．
就从新开启系统．
问题就解决了．

难道除了重启系统就找不到其他更好的解决办法了吗