:~$ 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.
:~$

我是寬頻用戶．
ｕｂｕｎｔｕ　無論是安裝在卓上電腦．或是虛擬器ｖｍ中．
上網到能連通．
如果有時不能上網．
就從新開啟系統．
問題就解決了．

難道除了重啟系統就找不到其他更好的解決辦法了嗎