“There are a few different problems that could be causeing this, but one thing that may help you is to remove the entry in your udev rules that refers to your wireless card. It sounds scary, but it’s really no biggie. Fire up a terminal and run
sudo gedit /etc/udev/rules.d/70-persistent-net.rules
And then find the line that refers to your wireless card. It will look something like this:
# PCI device 0x14e4:0x1713 (ipw3945) SUBSYSTEM=="net", DRIVERS=="?*", ATTRS{address}=="00:1a:a0:fd:19:af", NAME="wlan0"
Your memory offsets and MAC addresses will be different, but the main thing you’re looking for is the wlan0 and the ipw3945 (this might say iwl3945 instead). Remove (or comment out if removal make you nervous) these lines, save and reboot. Hopefully you’ll be in business.”
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