UbuntuLinux Henan Netcom Internet problems

UbuntuLinux Henan Netcom-general Linux technology-Linux technology and application information-see the following for details. In the past few days, I started to try Linux, and I used China Netcom's adsl at home. After reading some introductions on the internet, I still cannot upload them.
The general steps are as follows. Open a terminal and enter sudo pppoeconf, followed by yes. Enter a real user name. As a result, I still failed to connect to the Internet. I am very depressed. Please give me some advice. Thank you ~~~~~~