You'll never find out if you don't ask.
Sounds like a driver issue - odd for Ubuntu. From your liveCD enter this command from a terminal (enter your password when prompted)
sudo lshw -C network
In the segment for wireless, look for the driver name.
Do the same on your disk based system. If the driver is missing, try this
is what you got from the liveCD.
Else post back what you got at each stage, and see if anyone can help.