Comment 12 for bug 118205

Waiting for the official fix, you may want to know that there is a workaround which I'm temporarily using to be able to access internet in Gutsy with my Ralink 2500 (I believe this is somewhat similar to post #5 above).
You can find the patch that will allow the RT2500 configuration tool package to be used in Gutsy here:

https://bugs.launchpad.net/ubuntu/+source/rt2500/+bug/113054

This also contains the "legacy" rt2500 module that can easily be compiled with module-assistant.
I'm hoping that this will be uploaded soon to the repositories.