Wireless disappeared after upgrading on top of a tweaked kernel
sudo modprobe iwl3945 revealed a kernel-level error with an odd kernel number. I rediscovered that I had installed a different kernel prior to upgrading. It was newer than the 11.10 kernel and therefore continued to get used, and created havoc.
So:
- I ran
sudo apt-get install linux-image - Rebooted
- Held shift to force the grub menu to appear
- Chose the correct kernel
- Said thank you