How cat I detect Ethernet Card in mojo?(ubuntu)

hello,

My Usb to Ethernet device did not detect...

I type Ifconfig ......
It only show local(lo) 127.0.0.1

Some post, I found that Using dmesg can figure out ethernet device.
but I did not find anything...

There is blinking on the ethernet port.

Does anybody know the reason? How can I solve it?
Has anybody faced similar issue?

thanks.