Download speed is bad with a 100 Mbps wired network as well though it
seems faster than the wireless N network. So it looks  like this is a
different bug than #761176. I am seeing around 12-20Mbps for wired, 5-12
Mbps  for wireless and 20-30Mbps when using both together. Sometimes the
speed drops as low as 1Mbps accompanied by a long "connecting" time. By
comparison a Windows 7 notebook in the same room is getting 12 - 59
Mbps, via wireless N, most times well over 30Mbps. Upload speeds are
consistently 20-21Mbps on both systems.  All testing is with
www.speedtest.net.

If I install the 3.0 kernel how can I revert to the previous one, should
it be necessary?

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https://bugs.launchpad.net/bugs/815065

Title:
  ath9k driver in Natty kernel  2.6.38-10.46 still buggy

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