I've was having the same problem on my dell 2650 laptop, but after
running iwconfig <ifname> rate 54m and turning off cts protection on my
AP, i was able to get download speeds of over 6MB/s using the speedtest
at http://www.speakeasy.net/speedtest/.  when looking at dmesg | grep
<ifname> i noticed the interface is flapping between long and short
preamble, but it doesn't seem to have an affect on the connection speed
or reliability.

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Wifi working but at 1Mb/s
https://bugs.launchpad.net/bugs/201225
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