Comment 8 for bug 997114

I am still affected by this bug on a fully updated precise. For me, this is completely unrelated to 3G.
When I uncheck "Enable Wireless" in nm-applet, I cannot re-check it, and in "Network Settings" I see airplane mode is on, which cannot be disabled.
This workaround helps (from http://askubuntu.com/questions/119195/cannot-disable-airplane-mode):
sudo rfkill unblock wifi

From lspci -v on the affected machine:
02:04.0 Network controller: Intel Corporation PRO/Wireless 2200BG [Calexico2] Network Connection (rev 05)
 Subsystem: Hewlett-Packard Company nc6120/nx8220/nw8240
 Flags: bus master, medium devsel, latency 64, IRQ 21
 Memory at d8000000 (32-bit, non-prefetchable) [size=4K]
 Capabilities: <access denied>
 Kernel driver in use: ipw2200
 Kernel modules: ipw2200