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)
Code:
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
Code:
modprobe <driver-name>
where
<driver-name> is what you got from the liveCD.
Else post back what you got at each stage, and see if anyone can help.