My friend had the same problem because the driver you are using sets the
minimum speed rate to the device by default.
Try this command in a console and please tell us if it has worked for you.
Thanks!
sudo iwconfig ath0 rate 54M
** Changed in: network-manager (Ubuntu)
Status: New => Incomplete
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Slow network speed on intrepid
https://bugs.launchpad.net/bugs/280073
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