Galileo - Use LAN or USB for Linux

Hi
I've problem to connect my PC to the Terminal, my goal is to reach Linux Terminal.
I've found lots of item on internet, but no one does it work.

How can i open a Terminnal on Linux embedded SO of Arduino Galileo ?

The only code i have is the S/N of the LAN (if the access is by LAN) and the MAC address
The USB is the other solution ?
Help !!! :cold_sweat:
Thank you very much
Gianluca