Let's try some basic steps:
- Is one of the LEDs on the ethernet port on after powering the Galileo?
- Did you wait at least 30sec after turning off before a new start?
- Did you attached the ethernet cable to a network before you turned it on?
I use the LSB image too, and the only - regular - problem for me is, the Galileo does not recognize a connection, if I connect the cable *after* start up.