I notice a few things:

(1) The error messages reported by various people are not all exactly
the same. Perhaps they are having different problmes related to the same
firmware?

(2) I posted problems I had with one of these Ralink-based adapters
years ago. I used that same adapter on an up-to-date Debian machine
recently, and it has worked flawlessly under moderate use with Debian's
separate "firmware-ralink" package. I have yet to try it again on
Ubuntu.

(3) I understand that this driver is built in part from an open-source
driver (part of the Linux kernel; should be mostly standard across
Ubuntu and Debian), and in part from binary firmware images provided
freely by Ralink. Maybe Ubuntu is using an old or incorrect version of
the firmware? I will try to compare more sometime.

For information on the applicable Linux/Ralink project:
http://rt2x00.serialmonkey.com/wiki/index.php/Main_Page

Also, Wolfgang Kufner, why did you immediately change the "affects" away
from rt2x00 a few months back? Did you have a particular reason to
believe that it's not a problem with the rt2x00 driver? Maybe you knew
that this is a problem with the firmware, not with the open-source
rt2x00 code?

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https://bugs.launchpad.net/bugs/362875

Title:
  rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for
  offset

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