I have the same problem. Wireless is very slow for my Dell M14x after the upgrade - it worked perfectly with 11.04.
The link with instructions above seems to have helped a bit, but still very slow.
Does anyone know if there is a revert - to easily restore the previous version of Ubuntu? I'm guessing not but thought I'd ask.
I like a lot about 11.10 but without internet it is pretty useless
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