Wireless connectivity problem after upgrading to Ubuntu 10.10. – Simple Fix
If you look at /var/lib/NetworkManager/NetworkManager.state, you’ll notice WirelessEnabled=false. Change the value to true:
gedit /var/lib/NetworkManager/NetworkManager.state and reboot.
If that didn’t work,issue command “rfkill unblock all“.
If this doesn’t do it then it’s a problem with your wl drivers.(rule out any hardware problems before this). Go to System -> Administration -> Additional Drivers and find/activate the appropriate driver for use.