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Linux support WPA and _this_ chipset very well.
https://wiki.ubuntu.com/WifiDocs/RalinkRT2500
In the future, ubuntu will have NetworkManager with WPA support (you can try apt-get install NetworkManager).. for now we must do some tricks to have it.
This is always the case with Linux -- if there is poor hardware support by the manufacturers there is little developers can do to support those cards. Most of the a/g cards that do work manage this despite what seems like hostility on the part of the manufacturers. You're right -- it's sad, and it will continue to be sad so long as you buy hardware with a poor level of support. It sucks that you have to do some investigation to make sure what you're buying is well supported on Linux before you buy it, but that's the reality of the situation until the attitude of the hardware manufacturers change (if they ever do).
Regarding WPA specifically,as you mentioned wpa supplicant is available but the NetworkManager version that supports WPA did not make it into Ubuntu last I heard.





Member since:
2006-01-15
I have a PCI WiFi card based on the Ralink 2500 chipset, it's supposed to be fully supported in Linux. Ralink even makes GPL drivers for it, and it works well on Windows XP, but most distros don't even include the driver by default. Ubuntu does but it lacks WPA support, and it seems that the WPA Supplicant app doesn't support WPA with this chipset.
So far the only free OS that supports this chipset AND WPA is FreeBSD 6.0.
Isn't it shameful that with Windows, 5 minutes after taking the router from the box, I was able to set up a wireless connection with WPA2 personal. That 5 minutes after taking my 15" Powerbook from its box, I was able to join the wireless network. But with Linux, the best I can get is WEP? And that only if the distro actually includes the driver (Fedora and Gentoo for example, don't).