Ubuntu cannot be connected to the Internet.

Ubuntu cannot be connected to the Internet. For more information, see HOMEPNA-general Linux technology-Linux technology and application. My computer is a dual-hard-disk dual-system, ubuntu is separately mounted on the slave disk.
In XP, you can access the Internet normally. You can connect to the Internet by plugging in the USB cable directly without any dialing and without any account or password. You can access the Internet after you connect to the Internet.
I looked at the box that always thought it was a router, and the above was written as HOMEPNA.
Directly plugging in the USB connection line will show more than one network connection, you can also confirm the Internet is a network card.


After UBUNTU is installed, no connection is displayed on the network connection, but the NIC is displayed as gray,
In wired options, the NIC displays "never"

In this situation, how do I set up Internet access?