I just installed Karmic (x64) and had a different issue with my WUSB600N
(at least as described above), however the error messages above seem to
indicate the same root cause.

I found that while my WUSB600N would appear to be working, and could
connect to wireless G access points, it would not list or connect to
wireless N access points.

Running lsmod, I noticed that while there were rt (ralink) modules
loaded, of the six of them, none of them were dependencies of rt2780sta,
which is specific to the chipset of the WUSB600N. In fact, every module
other than rt2780 was a direct or indirect dependency of rt2800usb.
Blacklisting rt2800usb fixed my problem. Given that rt2x00 was disabled
as a consequence of blacklisting rt2800usb, I believe this may resolve
the above issue as well.

Temporary fix for people with similar problems:

echo "blacklist rt2800usb" | sudo tee -a /etc/modprobe.d/blacklist

then restart.

-- 
Linksys USB Network Adapter WUSB600N does not work
https://bugs.launchpad.net/bugs/433019
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