Comment 4 for bug 134962

The same problem here. I work for a high-school in Warsaw, Poland. We have more than 20 laptops with ASUS rt2500-based PCI cards we use in classrooms. In previous Ubuntu versions, at least since 6.06 our WiFi cards worked great. But after upgrading to Gutsy WiFi stopped working properly.

The Network Manager shows all the available networks, but when we try to connect, at least to our WPA-protected (TKIP) network, it asks for the key and than tries to connect for about 30 seconds, but than fails.

The lspci information for the card is:
07:00.0 Network controller [0280]: RaLink RT2500 802.11g Cardbus/mini-PCI [1814:0201] (rev 01)

There are some instructions in Ubuntu Forums that includes disabling the default driver shipped with 7.10 and compiling rt2x00.serialmonkey.com driver, but I haven't tried it yet:
http://ubuntuforums.org/showthread.php?t=584657