Ubuntu

Comment 0 for bug 460323

Karmic seems to try and load rt2870sta AND rt2800usb.
Breaks wireless connectivity.
Worked in Ubuntu 9.04 - Jaunty.

Confirmed Workaround:
Put the line 'blacklist rt2800usb' in /etc/modprobe.d/blacklist.conf and you are able to use wireless.

Details:
Tenda W322U 11N Wireless USB Adapter
Ubuntu 9.10 RC - Karmic

Linux neon 2.6.31-14-generic #48-Ubuntu SMP Fri Oct 16 14:05:01 UTC 2009 x86_64 GNU/Linux
Ubuntu 2.6.31-14.48-generic

lsusb
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 005: ID 06a3:8021 Saitek PLC Eclipse II Keyboard
Bus 001 Device 006: ID 05e3:1205 Genesys Logic, Inc. Afilias Optical Mouse H3003
Bus 001 Device 004: ID 0409:0059 NEC Corp. HighSpeed Hub

Bus 001 Device 002: ID 148f:2870 Ralink Technology, Corp.

Bus 001 Device 003: ID 0dbf:9001 Quik Tech Solutions
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

Others having this issue:
http://ubuntuforums.org/showthread.php?t=960642&page=7