Configuration of dial-up Internet access in Ubuntu

I was helpless when talking about installing ubuntu. I was originally installed with fedora13, but I was unable to solve the problem because I had to change ubuntu9 and finally got online, however, after the restart, I can't connect to the network, so I had to send a hope to ubuntu10. This problem is even more serious, and the Internet icons are gone. By referring to various posts and forums, finally, I found the solution and made a summary here.

FAQ

1. The Network icon in the upper right corner shows a red exclamation mark. What should I do if I cannot connect to the Internet?

Right-click it, And then edit it. During device configuration, change all network connections to local connections only ).

2. How does China Telecom dial up the Internet?

Open terminal InputSudo pppoeconf, Enter the user name and password as required, and then all the way to yes. EnterSudo Pon DSL-provider.

3. What should I do if the Network icon disappears in the upper right corner?

Terminal InputSudo gedit/etc/NetworkManager/nm-system-settings.conf, Change managed = true.

4. Why do I often lose connection after the Internet connection?

Terminal InputSudo gedit/etc/PPP/options, ModifyLCP-Echo-failure 40