Workaround for this bug in my case is to blacklist the specific wireless
kernel module and fall back on phys0 that was being used in version
priro to 11.10. I filed a duplicate bug:
https://bugs.launchpad.net/ubuntu/+bug/874229

I just added the following to /etc/modprobe.d/blacklist.conf and after
reboot or unload/reload modules all is well.

# hp wireless issues under 3.x kernel?
 blacklist hp_wmi

I did this for two laptops with almost the same specs.

Check and see if you have more than one module for wifi trying to load
and figure out the proper name to blacklist, not the same as indicated
by rfkill necessarily.

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https://bugs.launchpad.net/bugs/882779

Title:
  WLAN card cannot be activated, it is hard-rfkill-ed and fn-f2 does not
  work

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